The single recessive allele for hemophilia is expressed successfully in the:
Correct answer: C. Hemizygous son
- A. Hemizygous daughter
- B. Homozygous son
- C. Hemizygous son
- D. Heterozygous son
Explanation
In sex-linked (X-linked) traits males cannot be homozygous because the genes for such traits are located on X-chromosomes and males have single X-chromosomes. Thus males will be hemizygous dominant XH (Normal) or hemizygous recessive Xh (hemophilia).
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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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