The drosophila male is _ for eye colour.
Correct answer: B. Hemizygous
- A. Heterozygous
- B. Hemizygous
- C. Homozygous
- D. None of these
Explanation
Eye color in Drosophila is an X-linked trait. This means that males have only one allele for the gene as they have only one X chromosome, the other sex chromosome being Y. When there is only one allele for a trait instead of two, the individual is said to be hemizygous for that trait. XWY is a male with red eyes. XwY is a male with white eyes.
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About Inheritance
Mendel's laws explain segregation, independent assortment and the prediction of genetic ratios using alleles, genotypes and phenotypes. The chapter also covers linked genes, recombination and crossing over during meiosis, then applies pedigree reasoning to X-linked recessive traits, which show different inheritance patterns in males and females.
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