(i) what are chromosomes? where are they seated?
(ii) what is a sex chromosomes?
(III) Explain the mechanism of sex determination in human beings?
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i) Chromosomes are thread-like structures located inside the nucleus of animal and plant cells.
ii) Humans and most other mammals have two sex chromosomes, the X and the Y. Females have two X chromosomes in their cells, while males have both X and a Y chromosomes in their cells.
iii) Sex in humans is determined by the type of male haploid gamete that fuses with the female egg. The chromosome in the 23rd pair of a male gamete can be either X or Y.
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