- Created by: heyitsjen
- Created on: 30-11-18 14:32
Meiosis begins with one single cell. The cell makes a copy of each chromosome and divides up to make four new cells.
Why meiosis is important for fertilisation and survival chances:
- produces gametes with half genetic information from parent.
- for humans, gametes have 23 chromosomes each.
- when a sperm (23 chromosomes) fuses with an egg (23 chromosomes) an embryo cell forms with 46 chromosomes.
- fusing of gametes where half of male and half of female join, making genetic variation.
- genetic variation is essential for evolution and survival chances of species
- no two individuals are genetically identical so some genes will be an advantage with environment change/disease
Plants undergo mitosis to make clones. Two new daughter cells are made.They are genetically identical to the original cell.