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Mendelian Genetics
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Dominant Capital Letter Ex. W
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Recessive Lower case Letter Ex. ww no widow’s peak
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Co-Dominant Both traits expressed together
EX. Black cow and white cow get Black and White speckled cow (BW)
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Incomplete Dominance Neither allele is dominant so traits blend together Ex. Red flower and White flower = Pink flower (RW)
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Phenotype Physical Appearance
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Genotype Genetic Makeup
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Homozygous 2 of the same allele Ex. TT, tt
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Homozygous dominant Homozygous recessive
TT Homozygous recessive tt
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Heterozygous 2 different alleles Ex. Tt dominant
If something is heterozygous does it possess the dominant allele or recessive allele? dominant
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QUESTIONS If Yellow hair color (b) exhibits incomplete dominance with Blue hair color (B), what color would result from Bb? If Striped skin(S) is co- dominant with Polka dotted skin (P), what type of skin would result from the genotype PS?
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1. H h 4. 2. 5. HH Hh hh H 3. 3. h Word Bank: Heterozygous parent, Homozygous Dominant offspring, Homozygous recessive, Heterozygous offspring, Dominant allele, Recessive allele
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Allele: Varieties of genes, you receive 1 from each parent
Ex: Father: Aa Mother: Aa Dominant: A, trait is expressed Recessive: a, trait is only expressed when no dominant is present Mono: 1 trait A: dimples a: no dimples
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Oompah Loompah Genetics
A- Orange face a – Blue faces Genotype Phenotype AA Aa aa Orange Orange Blue
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Oompah Loompah Genetics
G- Green Hair g – Red Hair In Oompahs, GREEN hair is dominant and RED hair is recessive . Genotype Phenotype Green Hair Red Hair GG Gg gg
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Oompah Loompah Genetics
Mono-Hybrid Practice Oompah Loompah Genetics Page
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What is a DI-HYBRID Cross???
AAgg X aaGG Phenotypes of parents A- Orange face a – Blue faces Genotype Face Phenotype Hair Phenotype AAgg aaGG G - Green hair g – Red hair
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AAgg X aaGG X Ag aG Ag, Ag, Ag, Ag aG, aG, aG, aG
What will the offspring from this di-hybird cross look like? AAgg X aaGG Ag, Ag, Ag, Ag Parent 1 Gametes: Parent 2 Gametes: aG, aG, aG, aG X Ag aG AaGg
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Question Time: What genotypes are produced from this cross? Describe the phenotype of the offspring? (face and hair color) Will any offspring be homozygous recessive for either trait? Will any offspring be homozygous dominant for either trait? AaGg Orange face and green hair No NO
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AAgg X AAGG X Ag AG Ag, Ag, Ag, Ag AG, AG, AG, AG
What will the offspring from this di-hybird cross look like? AAgg X AAGG Parent 1 Gametes: Ag, Ag, Ag, Ag Parent 2 Gametes: AG, AG, AG, AG X Ag AG AAGg
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Question Time: What genotypes are produced from this cross? Describe the phenotype of the offspring? (face and hair color) Will any offspring be homozygous recessive for either trait? Will any offspring be homozygous dominant for either trait? AAGg Orange face and green hair No Yes, AA (orange face)
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AaGg X AaGg X AG Ag aG ag AG, Ag, aG, ag AG, Ag, aG, ag
What will the offspring from this di-hybird cross look like? AaGg X AaGg Parent 1 Gametes: AG, Ag, aG, ag Parent 2 Gametes: AG, Ag, aG, ag X AG Ag aG ag AAGG AAGg AaGG AaGg AAgg Aagg aaGG aaGg aagg
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Did you get it right? X AG Ag aG ag AAGG AAGg AaGG AaGg AAgg Aagg aaGG
How many offspring have orange faces and green hair? How many offspring have Orange faces and red hair? How many offspring have Blue faces ad green hair? How many offspring have blue faces and red hair? Did you get it right? 9 X AG Ag aG ag AAGG AAGg AaGG AaGg AAgg Aagg aaGG aaGg aagg 3 3 1
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BB bb Bb Incomplete Dominance
What is the genotype for each color if B represents a Black gene and b represents a White gene. Black White Grey BB bb Bb
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INCOMPLETE DOMINANCE-Practice together
What would happen if a farmer mated a black rabbit with a white rabbit? Complete a punnett square to determine the chances of each baby rabbit’s color. Give the genotypes and phenotypes for the offspring? How many of the rabbits would be black? How many of the rabbits would be white? How many of the rabbits would be grey? Bb 0% Grey 0% 100% b b Bb B Bb Bb Bb B
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INCOMPLETE DOMINANCE- Your turn
What would happen if a florist bred a pink rose (Rr) with a white rose (rr)? Complete a punnett square to determine what the offspring roses would look like. Give the genotypes and phenotypes for the offspring? How many of the roses would be red? How many of the roses would be white? How many of the roses would be pink? Rr, rr 0% White/pink 50% 50% r r Rr R Rr rr rr r
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Sex linked Traits- practice together
XB- not colorblind Xb-colorblind What would the genotype be of a colorblind man? What would the genotype be of a heterozygous female? Complete a punnett square to determine what their offspring would look like. What is the probability that they will have a child who is colorblind? What is the probability that they will have a colorblind daughter? What is the probability they will have a colorblind son? What % of their children are carriers? What sex is the carrier? Xby XBXb 50% 50% 50% XB Xb XBXb XbXb Xb 25% Female Xby XBy y
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Sex linked Traits- your turn
XB- not colorblind Xb-colorblind What would the genotype be of a normal man? What would the genotype be of a heterozygous female? Complete a punnett square to determine what their offspring would look like. What is the probability that they will have a child who is colorblind? What is the probability that they will have a child who is NOT colorblind? What is the probability that they will have a colorblind daughter? What is the probability they will have a colorblind son? What % of their children are carriers? XBy XBXb 25% 75% 0% XB Xb XBXB XBXb XB 50% Xby XBy y 25%
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Science Word Match Word Bank: Homozygous Heterozygous Dominant
Trait that is evident when only one allele is present? Form of genetics that incomplete and co dominance falls under? Trait that is evident only when two alleles are present? Genetic Makeup Physical appearance 2 of the same alleles 1 big letter and 1 small letter Word Bank: Homozygous Heterozygous Dominant Recessive Non Mendelian Genetics Genotype Phenotype
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