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प्रश्न
Explain why generally only the male child suffers from colour blindness and not the female?
उत्तर
Colourblindness is caused by recessive genes which occur on the X chromosome.
Males have only one X chromosome. If there is a recessive gene present on the X chromosome, then the male will suffer from colour blindness.
Females have two X-chromosomes. It is highly unlikely that both X chromosomes carry abnormal genes. As a result, if one gene is abnormal and recessive, the normal gene present on the other X chromosome will mask its expression. Females are unlikely to suffer from colourblindness.
The following cases explain the sex-linked inheritance of colour blindness.
Case 1
Case 2
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