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.
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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