A normal five-toed male cat mated with a six-toed female cat. The resulting litt

Question

A normal five-toed male cat mated with a six-toed female cat. The resulting litters of kitten consisted largely or entirely of six-toes cats. A. What does this suggest to you about the genetic basis of polydactyly in cats? B. Give the genotype of the stray, gives-toed male. C. If the stray male mated with a six-toes female that is heterozygous for polydactyly, what is the probability of: (1) a polydactylous kitten (2) a normal five-toed male kitten (3) a litter of six kittens in which 3 have five-toes and 3 have six-toes. My answers for these questions where it's a autosomal dominant gene, Pp for the male genetype, 75% for polydactylous kitten, 1/8 for normal five-toed male kitten and 9/256 for 3 six-tied and 3 five-toed. A normal five-toed male cat mated with a six-toed female cat. The resulting litters of kitten consisted largely or entirely of six-toes cats. A. What does this suggest to you about the genetic basis of polydactyly in cats? B. Give the genotype of the stray, gives-toed male. C. If the stray male mated with a six-toes female that is heterozygous for polydactyly, what is the probability of: (1) a polydactylous kitten (2) a normal five-toed male kitten (3) a litter of six kittens in which 3 have five-toes and 3 have six-toes. My answers for these questions where it's a autosomal dominant gene, Pp for the male genetype, 75% for polydactylous kitten, 1/8 for normal five-toed male kitten and 9/256 for 3 six-tied and 3 five-toed. A. What does this suggest to you about the genetic basis of polydactyly in cats? B. Give the genotype of the stray, gives-toed male. C. If the stray male mated with a six-toes female that is heterozygous for polydactyly, what is the probability of: (1) a polydactylous kitten (2) a normal five-toed male kitten (3) a litter of six kittens in which 3 have five-toes and 3 have six-toes. My answers for these questions where it's a autosomal dominant gene, Pp for the male genetype, 75% for polydactylous kitten, 1/8 for normal five-toed male kitten and 9/256 for 3 six-tied and 3 five-toed.

Explanation / Answer

A normal five-toed male cat mated with a six-toed female cat. The resulting litters of kitten consisted largely or entirely of six-toes cats.

Answer : autosomal dominant gene

The polydactyl allele is dominant over the allele for five toes and fingers.

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B. Give the genotype of the stray, gives-toed male.

genotype of the stray, gives-toed male    = pp five toe

Parent cats: heterozyg’ polydact’ female Pp x pp five toe male

p

p

P

Pp six-toes female

Pp six-toes female

p

pp five toe

pp five toe

Phenotypic ratio: 1:1           Polydact’ : five toe

Genotypic ratio: 1:1:0            Pp:pp:PP

(1) a polydactylous kitten =1/2 =0.5

(2) a normal five-toed male kitten=1/2 =0.5

(3) a litter of six kittens in which 3 have five-toes and 3 have six-toes.

N=6

P=0.5-------POLYDACTYLOUS

Q=0.5-------FIVE TOES

(p+q)^6 = p^6 +6p^5q +15p^4q^2+20p^3q^3+15p^2q^4+6pq^5+q^6

20p^3q^3 =20*(0.5)^3(0.5)^3 =0.3125 --------ANSWER

p

p

P

Pp six-toes female

Pp six-toes female

p

pp five toe

pp five toe

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