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Science

Sex determination

लिंग निर्धारण

In this Class 10 Science topic from the chapter Heredity and Evolution, students learn how sex is determined in humans through sex chromosomes. They examine the XX pattern in females and XY pattern in males, and understand that eggs carry an X chromosome while sperm may carry an X or Y chromosome. This explains why the chromosome contributed by the father determines the usual biological sex pattern, while also connecting chromosome inheritance to heredity and correcting the misconception that a child’s sex is caused by the mother.

Practice questions

Which chromosome combination is responsible for the birth of a girl in humans?EasyLevel 21What is the scientific basis for saying that the father's contribution is decisive in sex determination?MediumLevel 19If society blames the mother for the birth of a girl, what is the most scientific response?MediumLevel 19Why is the chance of a male and female child generally considered nearly equal?MediumLevel 19Which chromosome combination produces a boy in humans?EasyLevel 21