Haemophilia is more common in males because it is a
Correct answer: D. Recessive trait carried by X-chromosome
- A. Recessive character carried by Y-chromosome
- B. Dominant character carried by Y-chromosome
- C. Dominant trait carried by X-chromosome
- D. Recessive trait carried by X-chromosome
Explanation
The correct option is d) Recessive trait carried by X-chromosome. Haemophilia is a genetic disorder characterized by the impaired ability of blood to clot properly. It is caused by a mutation in one of the genes on the X chromosome that is involved in blood clotting. Since males have only one X chromosome, they have a higher risk of developing hemophilia if they inherit the mutated gene.
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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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