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Level 26

Reproduction


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Sexual reproduction
This produces genetically different cells to the mother and father cells. It is where the genetic information of two organisms is combined to produce offspring
Gametes
These are the cells that contain half the genetic material they should contain (an egg in a mother and sperm in the father). The contain 23 chromosomes that are not paired
Fertilisation
This is the fusion of the gametes
Asexual reproduction
This produces genetically identical cells. It is causes by an ordinary cell diving into two and it forms a clone of the original cell. It is used in the growth of bacteria and certain plants
X-shaped chromosomes
They have two identical halves
1st stage of asexual reproduction
The chromosomes split in half giving two identical copies
2nd stage of asexual reproduction
The DNA replicates itself once the cells have split