In a population of penguins, feather color is determined by alleles at 1 locus;

Question

In a population of penguins, feather color is determined by alleles at 1 locus; allele B for black and allele b for yellow. B is completely dominant to b. A second locus with two alleles (W and w) also influences feather color. W_ allows expression of B but ww does not allow expression of B so the color will be white. The two loci segregate independently but there is clearly an interaction between them. A male penguin 1 and a female penguin 2, both genotype BbWw, mate and produce over time 16 penguins.

a. What phenotypic classes for feather color are expected in the progeny?

b. What is the ratio among the phenotypic classes?

c. What fraction of the progeny is expected to be white?

d. How many of the 16 penguins are expected to have black feathers?

e. What kind of interlocus interaction is this? (Use ALL the terms necessary to describe it)

Explanation / Answer

BbWw x BbWw

BW Bw bW bw

BW BBWW BBWw BbWW BbWw Black = 9

Bw BBWw BBww BbWw Bbww White= 3

bW BbWW BbWw bbWW bbWw Yellow= 4

bw BbWw Bbww bbWw bbww

B_W_ = black

_BW_= black

_B_W= black

B_ _ W = black

B_ww = white

bbW_= yellow

bb_W= yellow

b. 9:3:4

c. 3/16

d. 9

e. Its a a case of Recessive epistasis

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