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In bunnies, variations are known at two unlinked genes responsible for the coat color. The product...

In bunnies, variations are known at two unlinked genes responsible for the coat color. The product of gene Y synthesizes a brown pigment, bunnies homozygous for the recessive loss-of-function allele y of this gene have yellow (golden) coat.The recessive allele b cannot make the black pigment. In a cross of a pure-bred yellow (golden) bunny to a pure-bred brown bunny all offspring are black. Expolain this and predict the frequencies of phenotypes of offspring in F2.

...and the frequencies of phenotypes in a cross of the black F1 bunny to a bunny with the genotype yybb.

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Answer #1

In the cross for the formation of F1 and f2 true breeding parents was considered in F0.

The results of the F1 and F2 was given in image.

In the part second: the recessive true breeding parent are allowed to cross with F1 child of part first.

Parent 1: YyBb Black

Parent 2: yybb brown

In this cross 3 different kind of progenies with 3 different phenotypes are observed which are as follows:

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