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Give Reason or Explain the Statement :Possibility of female becoming a haemophilic is extremely rare. |
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Answer» 1. Haemophilia is caused due to X-linked recessive gene. Females have double X chromosomes. 2. Even if she has haemophilic gene on one of her X-chromosome, the dominant gene on other Xchromosome, suppresses its expression. Female therefore, does not become haemophilic. 3. If she inherits haemophilic gene on both of her X-chromosomes, this combination becomes lethal. Such embryo is aborted. If born, she dies soon. This makes the possibility of female becoming a haemophilic extremely rare. |
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