Red eyes are dominant, and X -linked.
The female parent must be homozygous because she has the recessive white-eyed phonotype. The male parent is hemizygous, red-eyed. Genotypes and phenotypes of offspring All of the females eggs will contain an X chromosome with the white-eye mutation. The sperm will contain either a normal X chromosome or a Y chromosome. Summary We use a punnett square to predict the outcome of this cross.