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Probability question!?
The sex of the fruit fly Drosophila melanogaster is determined as follows: XX chromosomes give a female and XY give a male. The gene for bar eyes is recessive and located on the X chromosome. If a male with normal eyes is mated with a female who has normal eyes but is heterozygous,
a. All of the female offspring will have bar eyes
b. 1/2 the offspring will have bar eyes
c. 1/2 the males will have bar eyes
d. None of the offspring will have bar eyes
2 Answers
- Anonymous1 decade agoFavorite Answer
since normal eyes are obviously dominant (mom is hetero and normal), and we know that the only gene dad can give that will effect the phenotype is a normal eye gene (the other is a Y), then we can conclude that all the girls will have normal eyes (since one of their Xs comes from dad) and that 1/2 of the boys will be bars (since they get all their Xs from mom, who is hetero).
C
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