4. Cats are diploid animals that produce haploid gametes. In cats, genes that fo
ID: 3165777 • Letter: 4
Question
4. Cats are diploid animals that produce haploid gametes. In cats, genes that follow Mendel's Law of Independent Assortment control the characteristics of fur color and ear shape. For the fur gene, black fur is dominant over gray fur. For the ear shape gene, curled ears are dominant over straight ears If a cat that is homozygous for black fur and curled ears is crossed with a cat that homozygous for gray fur and straight ears, predict the genotype(s) of the Fi generation offspring. Be sure to define the symbols used to a represent each allele. b. Two cats from the Fi generation are crossed. Set up and fill in a Punnett square for this cross. c. List the possible phenotypes (fur color and ear shape) of the F2 offspring. d. What is the probability that a F: offspring will be heterozygous for both genes? What is the probability that a F, offipring will have gray fur and curled ears? e.Explanation / Answer
4a)
Genotype for Cat with black fur and curled ears = BB CC
Here B is for Black color and C is for the curled ears.
Genotype for Cat with gray fur and straight ears = bb cc
Now cross between both cats-
BBCC x bbcc
Gametes-
BC x bc
F1 generation- BbCc [Black fur and curled ear]
4b)
Now self cross between the two cats of F1 generation
BbCc x BbCc
F2 generation-
Gametes
BC
Bc
bC
bc
BC
BBCC black fur and curled ears
BBCc black fur and curled ears
BbCC black fur and curled ears
BbCc black fur and curled ears
Bc
BBCc black fur and curled ears
BBcc black fur and straight ears
BbCc black fur and curled ears
Bbcc black fur and straight ears
bC
BbCC black fur and curled ears
BbCc black fur and curled ears
bbCC Gray fur and curled ears
bbCc Gray fur and curled ears
bc
BbCc black fur and curled ears
Bbcc black fur and straight ears
bbCc Gray fur and curled ears
bbcc Gray fur and straight ears
4c)
We have mentioned all phenotypes of the F2 progeny. Here we get-
Black fur and curled ears = 9 offspring
Gray fur and curled ears = 3 offspring
Black fur and straight ears= 3 offspring
Gray fur and straight ears = 1 offspring
4d)
We have 4 offspring as Heterozygous for both genes (bold letters in the Punnet square). Therefore, the probability is= 4/16 =1/4
4e)
We know that Gray fur and curled ears are 3 offspring. Therefore, the probability is= 3/16
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Gametes
BC
Bc
bC
bc
BC
BBCC black fur and curled ears
BBCc black fur and curled ears
BbCC black fur and curled ears
BbCc black fur and curled ears
Bc
BBCc black fur and curled ears
BBcc black fur and straight ears
BbCc black fur and curled ears
Bbcc black fur and straight ears
bC
BbCC black fur and curled ears
BbCc black fur and curled ears
bbCC Gray fur and curled ears
bbCc Gray fur and curled ears
bc
BbCc black fur and curled ears
Bbcc black fur and straight ears
bbCc Gray fur and curled ears
bbcc Gray fur and straight ears
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