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Genetics and Genomics

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Dihybrid Cross: What Gametes are Produced?

GENES-DRYEBW

In American kestrels (Falco sparverius, a species of raptors) eye color and beak shape display dominant and recessive phenotypes: the allele for black eye color (B) is dominant to brown (b); the allele for notched beak (N) is dominant to the allele for a straight beak (n).

Consider two kestrels that are heterozygous for both loci. Assume no crossing over takes place during meiosis.

What gamete types are produced by a kestrel heterozygous for both loci?

A

BB; NN; bb; nn

B

BN; bn

C

Bn

D

bn

E

BN; Bn; bN; bn

F

BbNn; BBNN; bbnn