Q47 of 290 Page 169

Distinguish between a gamete and a zygote.

Gamete	Zygote
It is sex cell or germ cell that takes part in fertilisation.	It is a product of fertilisation.
It is two types: Male gamete and female gamete	It is one type
It carries characteristics of only one parent.	It carries characteristics of both the parents.

In tobacco plant, the male gametes have 24 chromosomes.

(i) What is the number of chromosomes in the female gamete?

(ii) What is the number of chromosomes in the zygote?

What would be the ratio of chromosome number between an egg and its zygote ?

Fertilisation in humans can occur only once in a month. Why?

What is the scientific name of (i) womb, and (ii) birth canal?