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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

In humans, the sex of a child depends on the chromosome coming from whose sperm?EasyLevel 19If a sperm carrying an X chromosome fuses with the egg, what will be the sex of the child?EasyLevel 19If a sperm carrying a Y chromosome fuses with the egg, what will be the sex of the child?EasyLevel 19In humans, the sex of the child depends on what?EasyLevel 20If an X chromosome comes from the father and an X chromosome comes from the mother, what will the offspring be?EasyLevel 20What determines the sex of a child in humans?EasyLevel 21Why is the father’s role considered decisive in sex determination of a human child?EasyLevel 19What combination will form when an X-chromosome sperm fuses with an X-chromosome egg?EasyLevel 19What combination will form when a Y-chromosome sperm fuses with an X-chromosome egg?EasyLevel 19Why is it scientifically wrong to blame the mother for the birth of a girl child?EasyLevel 19If the mother contributes X and the father contributes Y what will be the sex of the child?EasyLevel 20Why is the father's role considered clearer in determining the sex of a human child?MediumLevel 21If the egg has an X chromosome and the sperm has a Y chromosome, what will be the sex-chromosome combination of the child?EasyLevel 21If both the egg and the sperm contribute X chromosomes, what will be the sex-chromosome combination of the child?EasyLevel 21Why is the father’s contribution considered decisive for sex determination in humans compared with the mother’s?MediumLevel 19Blaming the mother for the birth of a girl child goes against which scientific fact?MediumLevel 19If a female sex-chromosome combination forms after fertilisation, which type of sperm caused it?MediumLevel 19If a sperm carrying the Y chromosome takes part in fertilisation, what will be the sex-chromosome combination of the child?MediumLevel 19Why is the father considered decisive in human sex determination?MediumLevel 20In humans, the sex of a child is mainly determined by what?EasyLevel 21