A female, tortoise-shell, tailless Manx cat mates with a male solid black taille

Question

A female, tortoise-shell, tailless Manx cat mates with a male solid black tailless Manx cat. Their first litter produced 1 tailless tortoise-shell female, 1 tailless black female, 1 tailed black female, 1 tailless orange male, 1 tailless black male and 1 tailed orange male. In the second litter, they had 1 tailed tortoise-shell female, 2 tailless black females, 1 tailless black male, 1 tailless orange male, and 1 tailed black male. (Hint: Look at each trait separately for phenotypic ratios, Mendelian vs NonMendelian patterns) A. What are the inheritance patterns of the two genes described? Coat color: Tail: B. What are the genotypes of the parents? Female: Male:

Explanation / Answer

Female cat - tortoise shell, tailless

Male cat - solid black, tailess

First litter: 1 tortoise shell tailless female, 1 black tailless female, 1 black tailed female, 1 orange tailless male, 1 black tailless male, 1 orange tailed male.

Second litter: 1 tortoise shell tailed female, 2 black tailless female, 1 black tailless male, 1 orange tailless male, 1 black tailed male

A) The color of the cat is X linked. X(B) which produces orange color is dominant over X(b) which produces black color. The presence of both these genes X(B),X(b) produces tortoise color.

Tailless (T) trait is carried on autosomes and is dominant over tailed (t). The presence of homozygous tailless allele (TT), is lethal.

B) Genotypes of the parents:

Female: X(B)X(b), Tt

Male: X(b),_ , Tt

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