Haemophilia B is due to abnormality of factor _.
Correct answer: C. IX
- A. VIII
- B. X
- C. IX
- D. XI
Explanation
Option A is wrong because haemophilia is not due to the abnormality of factor VIII. Option B is wrong because haemophilia is not due to the abnormality of factor X. Option: C Haemophilia is a rare X-linked recessive trait. Haemophilia B is caused by changes in the factor 9 gene on X chromosomes. KETS PMC Topic 13 Page # 282 Option D is wrong because haemophilia is not due to the abnormality of factor XI. It is due to the abnormality of factor IX.
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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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