If a carrier haemophilic female (XHXh) is married to a haemophilic male (XhY). What will be the ratio of the presence of haemophilia in the children?
Correct answer: B. Canier female 25% haemophilic female 25%, 25% normal male and 25% haemophilic male
- A. 100% all females and males will be haemophiliac
- B. Canier female 25% haemophilic female 25%, 25% normal male and 25% haemophilic male
- C. Females and males both have 50% chances to getting haemophilia
- D. Females have 50% chances of getting haemophilia and females will be 100% haemophilic
Explanation
Out of 4 children 1 son and 1 daughter would be haemophilic, 1 daughter can be a carrier and 1 son completely normal. So 2 out of 4 children are haemophilic. Hence the probability is 50%.
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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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