Body color in fruit flies is an example of a gene with two alleles: a dominant allele for brown body color, and a recessive allele for black body color. The brown body color allele can be ...

This complex example of overdominance may be the sole reason that the allele persists in the human population today (Keeton & Gould, 1986).

The tall allele is dominant and is shown as T. The small allele is recessive and is shown as t. Complete this Punnett square to show the possible allele combinations of the offspring produced when ...