Question

in a mouse population, black eyes (b) are dominant over red eyes (b). a black-eyed mouse, alpha, is bred to three mice, bravo, charlie and delta. bravo is red-eyed, and an offspring has black eyes. charlie is red-eyed, and an offspring has red eyes. delta is black-eyed, and an offspring has red eyes. what are the genotypes of alpha, bravo, charlie, and delta? group of answer choices alpha

Answer 1

Alpha, Bravo, Charlie, and Delta are mice with different eye colors indicating their genotypes. Alpha and Delta are heterozygous (Bb) and Bravo and Charlie are homozygous recessive (bb), based on the colored eyes of their offspring.

Step-by-step explanation:

In a mouse population, if black eyes (b) are dominant over red eyes (b), we can determine the genotypes based on the offspring produced in specific breeding scenarios. Alpha is black-eyed and when bred with Bravo, a red-eyed mouse, produced black-eyed offspring, indicating that Alpha must carry at least one b allele. Because all of Bravo's gametes must carry the recessive allele (being red-eyed and hence homozygous recessive), Alpha must have a genotype of Bb to produce black-eyed offspring. Charlie, also red-eyed, produced a red-eyed offspring with Alpha, which implies that Alpha could also donate a recessive allele, so Alpha is heterozygous Bb. Since Delta is black-eyed (dominant trait) and produced a red-eyed offspring with Alpha, both must be carrying the recessive allele. This indicates that Delta is likely heterozygous Bb as well. Therefore, Alpha is Bb, Bravo is bb, Charlie is bb, and Delta is Bb.