Sexual Reproduction And Meiosis

Question 1

What are the two gametes ?

Answer 1

Sperm cells - male

Egg cells - female

Question 2

How many chromosomes does a gamete have ? Is it haploid or diploid ?

Answer 2

23 chromosomes

Haploid

Question 3

What is a name for a fertilised egg?

Answer 3

A zygote

Question 4

What type of cell division does the zygote go through ?

Answer 4

Mitosis

Then develops into an embryo

Question 5

Which cell division process are gametes produced by ?

Answer 5

Meiosis

Question 6

What is meiosis ?

Answer 6

The process of producing 4 haploid cells whose chromosomes are not identical

Question 7

Where does meiosis happen?

Answer 7

Only in the reproductive organs -
The ovaries
And the testes

Question 8

In meiosis before the cell starts to divide what happens ?

Answer 8

The DNA is duplicated
The two arms are the exact copy of one another

Then the chromosomes line up

Question 9

Why are the pairs pulled apart after being lined up of the centre of the cell ?

Answer 9

So each cell has one copy of each chromosome

(Some will have father , mother ,mother and some would have mother , father , mother. The mixing up of the genes creates variation)

Question 10

What happens in division 1 and happened in division 2 again?

Answer 10

The chromosomes are lined up at the centre of the cell.

Then the arms are pulled apart.

Question 11

What is sexual reproduction ?

Answer 11

The fusion of the male and female gametes to produce an offspring with a mixture of their parents genes

(Involves male sperm cells and a female egg cell)

Question 12

What is the result of meiosis ?

Answer 12

4 haploid gametes - with single sets of chromosomes each , all genetically different