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OlgaM077 [116]
3 years ago
8

You perform a test cross of the dihybrid AaBb and score the phenotypes of 1000 progeny. Assuming independent assortment, how man

y of the progeny do you expect to display the dominant phenotype for both the A and B genes?
- 750
- 100
- 250
- 500
- 200

Biology
1 answer:
ahrayia [7]3 years ago
8 0

Answer:

250.

Explanation:

A test cross would cross the genotype AaBb with homozygous recessive genotype aabb. The cross between AaBB x aabb would produce progeny in 1:1:1:1 ratio. So, the proportion of the progeny expressing both dominant traits (AaBb) is 1/4.

Therefore, out of the total 1000 offspring, 1/4 x 1000= 250 would express the dominant phenotype for both A and B genes.

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Hope it helped,


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