Question

An ir
react
with
(i) Why human females have X-chromosome in all of their gametes?
(ii) How the sex of the children will be determined ?
(iii) Name an organism in which the individuals can change sex. What does this tells us
about the sex-determination in such organisms?

Answer 1

Answer:

1) During meiosis at the time of gamete formation, one X-chromosome enters each gamete. Hence, all the gametes formed in human females possess an X-chromosome.

2) A child's gender (male or female) is determined by the chromosome that the male parent contributes.

3) Snail is one such organism which can change it's sex during it's lifetime. This indicates that sex is not determined genetically in some animals.

Explanation: