- Statement 1: Haemophilia is a genetic disorder which leads to decrease in the white blood cells. This is incorrect. Haemophilia is a bleeding disorder caused by a deficiency in blood clotting factors, not affecting white blood cells. - Statement 2: The sex of new born baby is determined by the chromosomes inherited from the mother. This is incorrect. The mother contributes an X chromosome. The father contributes either an X or a Y chromosome via the sperm, thus determining the sex (XX for female, XY for male). - Statement 3: Haemophilia is low in women due to a dominant gene found on Y chromosome. This is incorrect. Haemophilia is an X-linked recessive disorder. It is less common in women than men because women have two X chromosomes (requiring both to be affected for the disorder, or one affected and skewed inactivation), while men have only one X (so one affected X results in the disorder). The Y chromosome is not involved, and the gene is recessive, not dominant.
Which of the following statements is/are correct ? 1. Haemophilia is a genetic disorder which leads to decrease in the white blood cells 2. The sex of new born baby is determined by the chromosomes inherited from the mother 3. Haemophilia is low in women due to a dominant gene found on Y chromosome
Asked in GPSC Prelims CSP 2 2019 · Topic: Genetic Disorders (Mendelian Disorders: Autosomal Dominant, Autosomal Recessive, X-linked)
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