Hemophilia is more common in males because it is a:
Correct answer: D. Recessive trait carried by X-chromosome
- A. Dominant trait carried by X-chromosome
- B. Recessive trait carried by Y-chromosome
- C. Dominant trait carried by Y-chromosome
- D. Recessive trait carried by X-chromosome
Explanation
Hemophilia A and B are rare X-linked recessive traits. Chances for a man to be affected by these are greater than those for a woman. A woman can only suffer from them when she is homozygous for the recessive allele, but a man with just one recessive allele will display the trait.
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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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