meiosis

Question 1

how many pairs of chromosomes are in the human cells

Answer 1

23

Question 2

how many chromosomes do gametes have and how many single chromosomes do human gametes have

Answer 2

1 23 single chromosomes

Question 3

where does meiosis take place

Answer 3

reproductive organs

male: testes

female:ovaries

Question 4

what are the stages of meiosis

Answer 4

1. all chromosomes are copied
2. the cell now divides into 2
3. now both cells divide 1 more time forming gametes

4.In the gametes, the chromosomes are now single not paired

5. Meiosis produces four gametes from one original cell. (Each of these four gametes are genetically different from each other and has different alleles)

Question 5

what does meiosis do to the original cells to the gametes

Answer 5

halves the number of chromosomes

Question 6

what happens to the gametes during the fertilization

Answer 6

1. when gametes join together
2. after fertilization the cell now has the normal number of chromosomes

Question 7

what does fertilisation do to the chromosomes

Answer 7

restores the full number of chromosomes

Question 8

What happens after fertilization?

Answer 8

Now the new cell divides by mitosis, producing a clump of identical cells.

Question 9

what happens when the embryo develops

Answer 9

the cells differentiate forming different cell types

Question 10

what type of cells are formed when the embryo is developing

Answer 10

nerve cells and muscle cells