Patterns of Inheritance. I: Mendel's laws Two factors called genes control each trait For each gene,...

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Patterns of Inheritance

Transcript of Patterns of Inheritance. I: Mendel's laws Two factors called genes control each trait For each gene,...

Page 1: Patterns of Inheritance. I: Mendel's laws Two factors called genes control each trait For each gene, organisms receive one allele (form) from each parent.

Patterns of Inheritance

Page 2: Patterns of Inheritance. I: Mendel's laws Two factors called genes control each trait For each gene, organisms receive one allele (form) from each parent.

I: Mendel's laws

Two factors called genes control each trait

For each gene, organisms receive one allele (form) from each parent randomly.

If an organism receives different alleles for the same trait, one allele is dominant over the other

Page 3: Patterns of Inheritance. I: Mendel's laws Two factors called genes control each trait For each gene, organisms receive one allele (form) from each parent.

II: Test crosses

Monohybrid cross Breeding individuals to

observe the inheritance of one trait

Ex: Mendel’s round vs wrinkled peas

Expected phenotypic ratio

3 dominant: 1 recessive

Page 4: Patterns of Inheritance. I: Mendel's laws Two factors called genes control each trait For each gene, organisms receive one allele (form) from each parent.

Test Crosses Continued…

Dihybrid cross Breeding individuals to

observe the inheritance of two separate traits

Ex: Mendel’s cross for shape and color

Expected phenotypic ratio: 9 dom dom: 3 dom rec: 3

rec dom: 1 rec rec

Page 5: Patterns of Inheritance. I: Mendel's laws Two factors called genes control each trait For each gene, organisms receive one allele (form) from each parent.

Practice time

Assume the following: A = round head a = square head B = belly button b = no button

If two parents are heterozygous for belly buttons what are the odds/percentages that their child will not have a belly button?

¼ or 25%

If parent #1 is homozygous dominant for both traits and parent #2 is homozygous recessive for both traits what are the odds/percentages their child will have a round head but no belly button?

0/16 or 0%

Page 6: Patterns of Inheritance. I: Mendel's laws Two factors called genes control each trait For each gene, organisms receive one allele (form) from each parent.

III: Complex inheritance

Incomplete Dominance: Blending of traits Heterozygotes, and homozygotes have

different phenotypes

Page 7: Patterns of Inheritance. I: Mendel's laws Two factors called genes control each trait For each gene, organisms receive one allele (form) from each parent.

Continued…

Co-dominance: Heterozygotes express both dominant

phenotypes

Page 8: Patterns of Inheritance. I: Mendel's laws Two factors called genes control each trait For each gene, organisms receive one allele (form) from each parent.

Continued…

Sex determination 23rd chromosome=X or Y XX=female XY=male

Sex linked traits: Genes for the traits

located on the sex chromosome

Ex: fruit fly eye color XR= Red Xr= white

Human color blindness

Page 9: Patterns of Inheritance. I: Mendel's laws Two factors called genes control each trait For each gene, organisms receive one allele (form) from each parent.

Continued…

Polygenic: Poly=many gen=genes Multiple genes are

responsible for the expression of the trait


Review What is an allele? What is a gene? Define phenotype. Define genotype. Each person inherits two Each person inherits two alleles for each gene, one.

Review What is an allele? What is a gene? Define phenotype. Define genotype. Each person inherits two Each person inherits two alleles for each gene, one.

Mendel's Monohybrid cross

Mendel's Monohybrid cross

Lecture 2.01: Mendel's Study - Scottsdale Community College

Lecture 2.01: Mendel's Study - Scottsdale Community College

Heredity: Mendel's experiments

Heredity: Mendel's experiments

Allele mining

Allele mining

Mendel's laws 31 1 2011

Mendel's laws 31 1 2011

Incompletely Dominant Allele When two different alleles are both dominant over another allele, but not dominant over each other. An example is a cross.

Incompletely Dominant Allele When two different alleles are both dominant over another allele, but not dominant over each other. An example is a cross.

5.1 mendel's experiments

5.1 mendel's experiments

Theoretical Genetics 4.3. 4.3.1 Define genotype, phenotype, dominant allele, recessive allele, recessive allele, codominant alleles, locus, homozygous,

Theoretical Genetics 4.3. 4.3.1 Define genotype, phenotype, dominant allele, recessive allele, recessive allele, codominant alleles, locus, homozygous,

Chapter 4: Modification of Mendelian Ratios Allele *Wild-type allele *Mutant allele Conventional symbols for alleles: recessive allele- initial letter.

Chapter 4: Modification of Mendelian Ratios Allele *Wild-type allele *Mutant allele Conventional symbols for alleles: recessive allele- initial letter.

GENETICS VOCABULARY QUIZ 2 · GENETICS VOCABULARY QUIZ 2 Allele Dominant Allele Recessive Allele Phenotype Genotype Heterozygous/Hybrid Homozygous/Purbred 1. 2 Allele Allele- one

GENETICS VOCABULARY QUIZ 2 · GENETICS VOCABULARY QUIZ 2 Allele Dominant Allele Recessive Allele Phenotype Genotype Heterozygous/Hybrid Homozygous/Purbred 1. 2 Allele Allele- one

Ch 5.1 Mendel's Experiments with Peas

Ch 5.1 Mendel's Experiments with Peas

Lecture 1: Mendel's Laws

Lecture 1: Mendel's Laws

Chromatin in a Normal Cell (one length from each parent) Allele Allele A version of a gene Dominant Dominant Allele that may mask the presence of.

Chromatin in a Normal Cell (one length from each parent) Allele Allele A version of a gene Dominant Dominant Allele that may mask the presence of.

GENETIC INHERITANCE - s5ee8b77f7f9dee0d.jimcontent.com€¦ · Genetic Inheritance Heterozygous Dominant allele Recessive allele • An allele which express its phenotype even in

GENETIC INHERITANCE - s5ee8b77f7f9dee0d.jimcontent.com€¦ · Genetic Inheritance Heterozygous Dominant allele Recessive allele • An allele which express its phenotype even in

Mendel's Genes

Mendel's Genes

Introduction to Genetics. Topics Mendel genetics –Mendel's experiments –Mendel's laws Genes and chromosomes –Linkage –Sex chromosomes, mtDNA, cpDNA Genes.

Introduction to Genetics. Topics Mendel genetics –Mendel's experiments –Mendel's laws Genes and chromosomes –Linkage –Sex chromosomes, mtDNA, cpDNA Genes.

Beyond Mendel's Laws of Inheritance

Beyond Mendel's Laws of Inheritance

Mendel's experiment on hybridisation and monohybrid cross

Mendel's experiment on hybridisation and monohybrid cross

C. MENDEL's LEGACY

C. MENDEL's LEGACY