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![Page 1: 1 Gregor Mendel. Mendelian Inheritance 2 Gregor Mendel Austrian monk Studied science and mathematics at University of Vienna Conducted breeding experiments.](https://reader036.fdocuments.in/reader036/viewer/2022062308/56649d6c5503460f94a4cc10/html5/thumbnails/1.jpg)
1Gregor Mendel
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2Mendelian IMendelian Inheritancenheritance
Gregor MendelGregor Mendel
Austrian monkAustrian monkStudied science and mathematics at Studied science and mathematics at University of ViennaUniversity of Vienna
Conducted breeding experiments with the Conducted breeding experiments with the garden pea garden pea Pisum sativumPisum sativum
Carefully gathered and documented Carefully gathered and documented mathematical data from his experimentsmathematical data from his experiments
Formulated fundamental laws of heredity in Formulated fundamental laws of heredity in early 1860searly 1860sHad no knowledge of cells or chromosomesHad no knowledge of cells or chromosomesDid not have a microscopeDid not have a microscope
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3Fruit and Flower of the
Garden Pea
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4Garden Pea TraitsStudied by
Mendel
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5Mendelian IMendelian Inheritancenheritance
Blending InheritanceBlending Inheritance
Theories of inheritance in Mendel’s time:Theories of inheritance in Mendel’s time:
Based on blendingBased on blending
Parents of contrasting appearance produce Parents of contrasting appearance produce offspring of intermediate appearanceoffspring of intermediate appearance
Mendel’s findings were in contrast with thisMendel’s findings were in contrast with this
He formulated the particulate theory of He formulated the particulate theory of inheritanceinheritance
Inheritance involves reshuffling of genes from Inheritance involves reshuffling of genes from generation to generationgeneration to generation
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6Mendel’s Monohybrid Crosses:An Example
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7Mendelian IMendelian Inheritancenheritance
One-Trait InheritanceOne-Trait Inheritance
Mendel performed cross-breeding Mendel performed cross-breeding experimentsexperiments
Used “true-breeding” (homozygous) plantsUsed “true-breeding” (homozygous) plants
Chose varieties that differed in only one trait Chose varieties that differed in only one trait (monohybrid cross)(monohybrid cross)
Performed reciprocal crossesPerformed reciprocal crosses
Parental generation = PParental generation = P
First filial generation offspring = FFirst filial generation offspring = F11
Second filial generation offspring = FSecond filial generation offspring = F22
Formulated the Law of SegregationFormulated the Law of Segregation
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8Mendelian IMendelian Inheritancenheritance
Mendel’s Monohybrid Mendel’s Monohybrid Crosses:Crosses:An ExampleAn Example
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9Mendelian IMendelian Inheritancenheritance
Law of SegregationLaw of Segregation
Each individual has a pair of factors (alleles) Each individual has a pair of factors (alleles) for each traitfor each trait
The factors (alleles) segregate (separate) The factors (alleles) segregate (separate) during gamete (sperm & egg) formationduring gamete (sperm & egg) formation
Each gamete contains only one factor (allele) Each gamete contains only one factor (allele) from each pairfrom each pair
Fertilization gives the offspring two factors Fertilization gives the offspring two factors for each traitfor each trait
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10Mendelian IMendelian Inheritancenheritance
Modern Genetics ViewModern Genetics View
Each trait in a pea plant is controlled by two Each trait in a pea plant is controlled by two alleles (alternate forms of a gene)alleles (alternate forms of a gene)
Dominant allele (capital letter) masks the Dominant allele (capital letter) masks the expression of the recessive allele (lower-expression of the recessive allele (lower-case)case)
Alleles occur on a homologous pair of Alleles occur on a homologous pair of chromosomes at a particular gene locuschromosomes at a particular gene locus
Homozygous = identical allelesHomozygous = identical alleles
Heterozygous = different allelesHeterozygous = different alleles
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11Homologous Chromosomes
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12Mendelian IMendelian Inheritancenheritance
Genotype Versus PhenotypeGenotype Versus Phenotype
Genotype Genotype
Refers to the two alleles an individual has for Refers to the two alleles an individual has for a specific traita specific trait
If identical, genotype is homozygousIf identical, genotype is homozygous
If different, genotype is heterozygousIf different, genotype is heterozygous
Phenotype Phenotype
Refers to the physical appearance of the Refers to the physical appearance of the individualindividual
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13Mendelian IMendelian Inheritancenheritance
Punnett SquarePunnett Square
Table listing all possible genotypes resulting Table listing all possible genotypes resulting from a crossfrom a cross
All possible sperm genotypes are lined up on All possible sperm genotypes are lined up on one sideone side
All possible egg genotypes are lined up on the All possible egg genotypes are lined up on the other sideother side
Every possible zygote genotypes are placed Every possible zygote genotypes are placed within the squareswithin the squares
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14Punnett Square ShowingEarlobe Inheritance
Patterns
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15Try this one
MONOHYBRID CROSSMONOHYBRID CROSSCross a heterozygous tall plant with Cross a heterozygous tall plant with a heterozygous tall plant (use T = a heterozygous tall plant (use T = tall and t = short) Determine tall and t = short) Determine expected genotype and phenotype expected genotype and phenotype ratios.ratios.
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16
Try these!Show work
1.Crossaheterozygousredflowerwithawhiteflower.Whatisthegenotypeandphenotyperatiofortheoffspring?Key:R=redr=white
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17Mendelian IMendelian Inheritancenheritance
Two-Trait InheritanceTwo-Trait Inheritance
Dihybrid cross uses true-breeding plants Dihybrid cross uses true-breeding plants differing in two traitsdiffering in two traits
Observed phenotypes among FObserved phenotypes among F22 plants plants
Formulated Law of Independent AssortmentFormulated Law of Independent Assortment
The pair of factors for one trait segregate The pair of factors for one trait segregate independently of the factors for other traitsindependently of the factors for other traits
All possible combinations of factors can occur All possible combinations of factors can occur in the gametesin the gametes
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18Mendelian IMendelian Inheritancenheritance
Try Mendel’s Classic Dihybrid CrossTry Mendel’s Classic Dihybrid Cross
Cross two heterozygous tall, heterozygous Cross two heterozygous tall, heterozygous green pod producing plants. Use a punnett green pod producing plants. Use a punnett square to show expected offspring and square to show expected offspring and complete a phenotype ratio.complete a phenotype ratio.
Key:Key:
T = tallT = tall G = green podsG = green pods
t = shortt = short g = yellow podsg = yellow pods
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19Two-Trait (Dihybrid) Cross
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20Must Know Your Vocab!
Homozygous?Homozygous?Heterozygous?Heterozygous?Genotype?Genotype?Phenotype?Phenotype?
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21Try this one – DIHYBRID CROSS2 traits
Key:T=tall R=red t=shortr=white Crosstwoheterozygoustall,
heterozygousredfloweredplants. Whatisthephenotypicratioofthe
offspring?
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22Two-Trait (Dihybrid) Cross
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23P-square practice
Practice crosses – on a separate Practice crosses – on a separate sheet of paper.sheet of paper.
• Show parental crossShow parental cross• Show p-squareShow p-square• Show phenotype ratioShow phenotype ratio
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24
WHAT’s IN YOUR GENES?WHAT’s IN YOUR GENES?
Mom = 22 autosomes plus X sex Mom = 22 autosomes plus X sex chromosomechromosome
Dad = 22 autosomes plus X or Y Dad = 22 autosomes plus X or Y chromosomechromosome
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25
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26Boy or Girl?
Dad determines this – sperm carries Dad determines this – sperm carries 22 autosomes and either an X or Y 22 autosomes and either an X or Y sex chromosomesex chromosome
BOYS – your mom gave you the X BOYS – your mom gave you the X and dad gave you the Y – so what?and dad gave you the Y – so what?
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27
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28
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29Sex-linked – disorders carried on the
X chromosome
- ColorblindnessColorblindness- HemophiliaHemophilia- Baldness (?)Baldness (?)
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30Analyze Sex-linked traits
Due tom!Due tom!
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31
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32
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33
- Albinism ppt - Albinism ppt - Huntingtons pptHuntingtons ppt- Final conceptsFinal concepts
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34Autosomal Recessive Pedigree Chart
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35Autosomal Dominant Pedigree Chart
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36
INHERITING A GENE - ALBINISM
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37This is an albino
skunk. The cells are not
able to produce the protein that
causes color.
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38
Cells in the skin produce a black-brown pigment called melanin.
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39The chemical melanin is
produced by specialized cells in the epidermis
called melanocytes.
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40
The melanin leaves the melanocytes and enters other cells closer to the surface of the skin.
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41Different shades of skin
colors is determined by the amount of
melanin deposited in
these epidermal cells
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42Sunlight causes
melanocytes to increase production of melanin.
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43
A tan fades because the cells break down the melanin.
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44
Some organisms, such as the
octopus, can
rapidly change
from light to dark.
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45
They control the color by scattering the melanin in the cell for a dark color, and concentrating the melanin in the
center for light color.
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46
Melanin is made by the melanocytes by chemically changing the amino
acid, phenylalanin, into tyrosine and then into melanin.
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47
An enzyme is required to change tyrosine into melanin.
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48
If the enzyme is not present, then melanin
cannot be produced by the melanocytes.
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49The result of no melanin is an albino.
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50
The eyes of an albino appear pink because there is no dark melanin
in the eye to absorb light.
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51
The blood in the retina and iris reflects red light, resulting in pink
eyes.
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52
The gene that
produces this
enzyme is on
chromo-some 9
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53
If both the genes produce
the enzyme tyrosinase,
there is plenty to convert tyrosine to melanin.
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54
If neither gene
produces tryosinase,
no melanin is produced
and…
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55The crow is
an albino rather
than the normal black
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56
What if one gene is
normal and one gene does not produce the enzyme?
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57The one normal gene produces enough enzyme to make normal crow
color
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58
This albino squirrel received one albino gene from the father and one albino gene from the mother.
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59
But what if a squirrel gets a normal gene
from one parent and an albino gene from
the other parent?
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60The one functioning
gene produces enough enzyme
to make melanin for
normal coloration.
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61Is it possible for two normal colored
cockatiels to have an
albino offspring?
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62Yes!
Remember the albino
has two genes for albinism. One gene from the
father and one gene from the mother.
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63
To be albino, both genes must be albino
genes
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A normal colored bird could have one albino
gene and one normal gene.
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If the sperm of a normal colored male pigeon has an albino gene and the ova it fertilizes has
an albino gene than the offspring will be albino.
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66The same happens in humans. A
normal pigment
father and mother can
have an albino
offspring.
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We can see this in a genetic “family tree” called a pedigree. The circles are
females, the squares are males. The open symbols are normal coloration, the black
symbols are albino.
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The parents in the circle have normal pigment.
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Most of the offspring received at least one normal gene from
a parent.
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But one female offspring received an albino gene from
both the mother and the father.
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71A Punnett square is a matrix to show the genetics of a mating.
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What is the probability of an albino doe giving
birth to a “normal” fawn if she has mated
with a “normal” male?
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73The female must
have two albino genes
(use small “a” for
the albino gene
- aa
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74Since the albino gene is
relatively rare, the male probably has two normal genes of color. (Capital
“A” stands for the normal gene)
- AA
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75AA X aa
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76Next, add the possible sperm and ova genes.
A A
a
a
Aa Aa
Aa Aa
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77As long as there is one normal gene, none of the offsprings will be albino A A
a
a
Aa Aa
Aa Aa
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78Therefore, all offsprings will have a normal and an albino gene.
A A
a
a
Aa Aa
Aa Aa
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79An albino must get one
albino gene from the father and one albino gene from the mother.
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80Then how could an albino female
penguin have an
albino chick.
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The “normal” colored father must have one
“normal coloration gene and one albino gene.
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There is only one way for two normal colored parents to produce an albino
offspring.
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Both parents must have one normal
gene and one albino gene.
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Aa X AaBoth parents have one gene for normal and one gene for albinism.
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Aa X Aa
A
a
The father’s sperm is 50% with normal gene and 50% with albino gene.
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Aa X Aa
A
a
50% of the mother’s ova have a normal gene and 50% of the ova have the albino gene
A a
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Aa X Aa
A
a
A a
AA
aaAa
Aa
The ova and sperm may combine to form an offspring with two normal genes, a normal gene and an albino gene, or two albino genes.
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Aa X Aa
A
a
A a
AA
aaAa
Aa
Only the offspring with two albino genes will lack pigment.
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89Sometimes an albino is born and there is no history of albinism in the colony.
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The color gene in the
cell that produced this white flower
changed to an albino gene.
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A change in a gene is called a mutation.
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