3) (2 pts) In a certain breed of dog, the dominant, B, is required for black...

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Answer 3:

It is given that I gene is showing dominant epistasis on B gene. I gene inhibits the expression of B gene.

A) bbii: Here brown phenotype is produced because ii and bb both are in recessive form.

BbIi: here I gene inhibit the B gene expression and brown color phenotype is seen.

Parents: bbii × BbIi

Punnet square:

B) BbIi : brown because I inhibit the expression of B gene

Bbii: Black phenotype because I is in recessive form. That's why B gene encodes black phenotype.

Parents: BbIi × Bbii

Punnet square:

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