Final answer:
Jill's genotype for brown eyes is likely Bb, representing a dominant brown allele and a recessive allele. For a cross between a white-eyed male and a heterozygous red-eyed female, about 50% of the male offspring will have red eyes, and 50% of the female offspring will be heterozygous with red eyes.
Step-by-step explanation:
If Jill has hybrid brown eyes, her genotype for eye color could be Bb, where 'B' represents the dominant brown eye allele and 'b' represents a recessive allele which could result in blue or another color if in a homozygous recessive pair (bb).
A cross between a white-eyed male and a heterozygous red-eyed female results in a specific ratio of offspring, assuming that eye color is determined by a sex-linked gene. Given that males have one X chromosome and females have two, the male can either be hemizygous dominant or hemizygous recessive, while the female offspring can be heterozygous or homozygous recessive.
The predicted ratio, therefore, is that approximately 50% of the male offspring will inherit the red eye color (if the gene for red eyes is present on their single X chromosome) and 50% will inherit white eyes. For females, since they have two X chromosomes, approximately 50% will be heterozygous with red eyes and 25% could be homozygous recessive with white eyes, given that the red eye color allele is dominant over the white eye allele.