WELCOME BACK!!! In Activity: Mendel & His Work
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Transcript of WELCOME BACK!!! In Activity: Mendel & His Work
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Pick up your sheet from countertop
Read the FRONT Complete the BACK
side by creating your own pea plant crosses for each generation.
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Genetics – The Study of Genetics – The Study of HeredityHeredityTEKS 6FPredict possible outcomes of various genetic combinations such as monohybrid crosses, dihybrid crosses, and non-Mendalian inheritance
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Mendel cross-Mendel cross-pollinated pea pollinated pea plantsplants
He cut away the male parts of one flower, then dusted it with pollen from another
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Mendel’s ConclusionsMendel’s ConclusionsHe concluded that factors (traits) are passed from one generation to the next.
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Types of Types of AlleleAllele pairingpairing
HomoHomozygous zygous (purebred)(purebred) both alleles are the same
(BB – Brown eyes)
(bb – blue eyes)
HeteroHeterozygous zygous (hybrid)(hybrid) two different alleles
(Bb – Brown eyes)
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GenotypeGenotypeOutward
appearancePhysical
characteristics
Examples:1.Brown eyes2.blue eyes
Arrangement of genes that produces the phenotype
Example:1. BB, Bb2. bb
PhenotypPhenotypee
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Monohybrid CrossMonohybrid Cross
BB
Bb
Bb
bb
B
b
B b
Bb x Bb
BB= homozygous dominant; 1 of 4 = 25%
Bb= heterozygous dominant; 2 of 4 = 50%
bb= homozygous recessive; 1 of 4 = 25%
Chances of Brown Eyes: 3 of 4 = 75%
Chances of Blue Eyes: 1 of 4 = 25%
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Dihybrid Cross: Dihybrid Cross: RrYy RrYy xx RrYyRrYy
Here’s your game plan:FIRST: FOIL the parent alleles just like you do for polynomials in math class
(Rr) (Yy) x (Rr) (Yy)(Rr) (Yy)First: RY RYRYOuter: Ry RyRyInner: rY rYrYLast: ry ryry
CROSSES WITH TWO DIFFERENT TRAITS
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Dihybrid Cross: Dihybrid Cross: RrYy x RrYy x RrYyRrYy
RYRY RyRy rYrY ryry
RYRY
RyRy
rYrY
ryry
SECOND: take your results from your FOILing and place them on the sides of your Punnett square! Add like letters to like letters in the boxes.
RRYY
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Dihybrid CrossDihybrid Cross
RRYY
RRYy
RrYY
RrYy
RRYy
RRyy
RrYy
Rryy
RrYY
RrYy
rrYY
rrYy
RrYy
Rryy
rrYy
rryy
Smooth/Yellow: 9 of 16
Smooth/green: 3 of 16
wrinkled/Yellow: 3 of 16
wrinkled/green: 1 of 16
9:3:3:1 phenotypic ratio
RYRY RyRy rYrY ryry
RYRY
RyRy
rYrY
ryry
THIRD: Complete your Punnett square! Use the results to analyze phenotypicphenotypic & genotypic outcomes.
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Dihybrid Cross: crosses with Dihybrid Cross: crosses with two different two different traitstraits
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Genetics Unit Overview Video Genetics Unit Overview Video Clip:Clip:Dihybrid Cross Dihybrid Cross SHORT CUT…SHORT CUT…
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Let’s Practice Predicting Let’s Practice Predicting Probability of Probability of DihybridDihybrid Crosses:Crosses:
ACTIVITIES: 1.Guinea Pig Dihybrid Cross Practice (Notes)2.Dihybrid Cross Worksheet Turn-in #2 ONLY above for a Grade
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EXIT TICKET: EXIT TICKET: Punnett Square PracticePunnett Square Practice
Do BOTH sides by completing monohybrid/dihybrid genetic crosses.
What you don’t finish will be H.W. due 1/14/14
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H.W. Due 1/14/14H.W. Due 1/14/14
Finish Punnett Square Practice Handout
Study Quizlett.com Vocabulary Words for Genetics◦Quiz #1: Meiosis & Quiz #1: Meiosis &
Genetics is 1/14/14Genetics is 1/14/14◦KIM Blocks will be
done next weeknext week
Study Quizlet.com◦Search “rrisd
biology”◦Select “Genetics”