In cats tiger pattern (T) is dominant over black color (t). On another chromosom

Question

In cats tiger pattern (T) is dominant over black color (t). On another chromosome are alleles for tail length, B + b which have the expression BB, tailless or manx, Bb botailed and bb, long tailed

Parent cats are TtBb x TtBb

a) what proportion of their offspring would be black in color?

b) What proportion of their ofspring would be manx cats?

c What proportion of the offspring would be black and bobtailed?

Tt Bb

Bb   

Tt

Im still having trouble setting up the and i dont think this is correct some help would be much appreciated.

Explanation / Answer

a) You're crossing Tt with Tt. The possible genotypes are: TT, Tt, Tt and tt. Black is recessive so the only way to get it is to gain the "tt" genotype. Therefore, 1 out of every 4 will be black. b) You're crossing Bb with Bb. The possible genotypes are: BB, Bb, Bb and bb. manx = BB. Therefore, 1 out of eery 4 will be Manx c What proportion of the offspring would be black and bobtailed (Bb)? Looking back at "b" there is a 1/2 chance be being bobtailed and we already know there is a 1/4 chance of being black so. (1/4) X (1/2) = 1/8 chance of being black and bobtailed.

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