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Harrizon
2 months ago
9

You are studying body color in an African spider and have found that it is controlled by a single gene with four alleles: B (bro

wn), br (red), bg (green), and by (yellow). B is dominant to all the other alleles, and by is recessive to all the other alleles. The bg allele is dominant to by but recessive to br. You cross a brown (B/by) spider with a pure-breeding green spider. Predict the phenotype of the progeny.
Biology
1 answer:
enyata [2.5K]2 months ago
5 0

Answer:

50% are brown.

50% are green.

Explanation:

Given:

B allele corresponds to brown color, therefore B = brown,

br = red,

bg = green,

by = yellow.

B is the dominant allele for all;

bg dominates over by;

br predominates over bg;

while by is recessive compared to all other alleles.

We have a cross between a brown (B/by) and a pure green (bg/bg).

B/by × bg/bg

resulting offspring

Genotype includes B/bg, B/bg, by/bg, and by/bg.

Resulting Phenotypes are B/bg = brown;

by/bg = green

Thus, 1 out of 2 offspring are brown and 1 out of 2 are green.

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