Question

The belief that the mother is completely responsible for the sex
of the child is wrong because the child
(a) gets sex chromosome only from the mother.
(b) develops in the body of the mother.
(c) gets one sex chromosome from the mother and the other
from the father.
(d) gets sex chromosome only from the father.


NCERT Class VIII
Science - Exemplar Problems

Chapter 10. Reaching the Age of Adolescence

Answer 1

The answer is c]Gets one sex chromosome from the mother and the other from the father

Answer 2

Answer:

Option C is the correct answer

gets one sex chromosome from the mother and the other

• Female sex gametes have two X chromosomes, while male gametes have X and Y chromosomes.
• The male gamete's fusion with the female gamete determines the child's sex.
• If an X gamete fuses, the resulting zygote has XX chromosomes, resulting in a female kid, as opposed to a zygote with XY chromosomes, which results in a male child.

Explanation:

• The likelihood of having a boy and a girl is almost equal for almost everyone.
• What we can say is that a baby's gender—whether a boy or a girl—is determined by the father's sperm. He will produce about equal amounts of boy and girl sperm. The first sperm to reach the egg determines the baby's sex.
• Everything would be up to chance in an ideal world. There would be an equal likelihood for both sperm types to contact the egg first. Each type of egg would also have an equal probability of successfully growing into a baby after fertilization.

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