a. White-eyed female and red-eyed male.
b. Heterozygous red-eyed female and red-eyed male.
c. Homozygous red-eyed female and white-eyed male.
d. Heterozygous red-eyed female and white-eyed male.
e. White-eyed female and white-eyed male
Since males only have one X chromosome the will always only have one eye color allele determining what color eyes they will have.
Females on the other hand have two X chromosomes so their eye color is determined by both alleles. In this case we are told red eye color 'R' is dominant and white eye color 'r' is recessive. So in females the genotypes RR, Rr, rR will be red eyes. Only the rr genotype will have white eyes.
In males R will obviously be red and r white.
In each of these crosses we will always have 50% males and 50% females. Half of the males (25% of total ...
Calculates expected offspring's eye color frequency in crosses of fruit flies where eye color is on the X chromosome and red eyes R is dominant of white eyes r.