Which of the following types of Haemophilia is more common in the human population?
Correct answer: A. Haemophilia A
- A. Haemophilia A
- B. Haemophilia B
- C. Haemophilia C
- D. Haemophilia VII
Explanation
Haemophilia A, also known as classic haemophilia, is the most common type of haemophilia, accounting for about 80-85% of all haemophilia cases. It is caused by a deficiency or dysfunction of factor VIII, a protein essential for blood clotting.Haemophilia A is an X-linked recessive disorder, meaning that the gene responsible for the condition is located on the X chromosome. This means that:- Males are more likely to be affected, as they have only one X chromosome- Females can be carriers, but are less likely to be affected, as they have two X chromosomes
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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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