In goats, a beard is produced by an autosomal allele that is dominant in males a

Question

In goats, a beard is produced by an autosomal allele that is dominant in males and recessive in females. Well use the symbol B^b for the beard allele and B^+ for the beardless allele. Another independently assorting autosomal allele that produces a black coat (W) is dominant over the allele for white coat (w). Give the phenotypes and their expected proportions for the following crosses. a. B^+ B^b Ww male times B^+ B^b Ww female b. B^+ B^b Ww male times B^+ B^b ww female c. B^+ B^+ Ww male times B^b B^b Ww female d. B^+ B^b Ww male times B^b B^b ww female

Explanation / Answer

A. Beard Black * Beard Black ratio - 9 Beard Black :3 Beard white:3 Beard less Black:1 Beardless white

B. Beard Black * Beard White Ratio - 3Beard Black:3 Beard white:1 Beardless Black:1Beardless white

C. Beardless Black * Beard Black ratio - 12 Beard Black: 4 Beard white

D. Beard Black * Beard White Ratio - 8 Beard Black:8 Beard white

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