A breeder of sun conures (a type of bird) has obtained two true-breeding strains, A and B, which have red eyes instead of the normal brown found in natural populations. In Cross 1, a male from strain A was mated to a female from strain B, and the male and female offspring all had brown eyes. In Cross 2, a female from strain A was mated to a male from strain B, and the male offspring had brown eyes and the female offspring had red eyes. When the F1 birds from each cross were mated brother to sister, the breeder obtained the following results:

Provide a genetic explanation for these results.

Transcribed Image Text:

Proportion in F, of Cross 1 6/16 3/16 Proportion in F, of Cross 2 3/16 Phenotype Brown male Red male Brown female Red female 5/16 3/16 5/16 3/16 5/16