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Home Q & A Board Biology-Related Homework Help Genetics and Developmental Biology
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microbeman microbeman
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11 years ago
The allele for eye-color gene is X-linked. A brown-eyed female is crossed to a red-eyed male. What are the phenotypes (and in what percentages) among their offspring? Include sex as part of the phenotype.

I have such issues with these genetics problems.. and assistance will be GREATLY appreciated.
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RLC
wrote...
#1
11 years ago
73% are you stupid maybe your parents have poor genes. their dominant allele is stupid that is why you became stupid.
wrote...
#2
11 years ago
Key:
R - red eyes (red is upper case because it is dominant)
r - brown eyes

The females genotype must be XrXr because the characteristic (brown eyes) is recessive so therefore both alleles have to be (r). The red eyed male must be XRY because characteristics cannot be carried on the Y chromosome.

When you cross XrXr x XRY, you get 100% phenotype of males with brown eyes and 100% phenotype of females with red eyes.
Their genotypes will be; male offspring: XrY, female offspring: XRXr
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