A carrier of haemophilia is typically
Correct answer: B. a heterozygous woman with one normal and one haemophilia allele
- A. a man suffering from the disease
- B. a heterozygous woman with one normal and one haemophilia allele
- C. a homozygous normal woman
- D. a person with an extra chromosome
Explanation
A carrier holds the recessive allele without symptoms because the normal allele on her other X is enough for clotting. A man with the allele is affected rather than a carrier, since he has no second X.
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About Mendel's Laws of Inheritance
Mendelian inheritance explains how alleles separate into gametes and assort during reproduction, producing predictable genotype and phenotype ratios. Questions cover dominance, recessiveness, homozygous and heterozygous conditions, the laws of segregation and independent assortment, monohybrid and dihybrid crosses, test crosses and the limits caused by linked genes.
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