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Cell division

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by

Harvey Buckle

on 3 February 2017

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Transcript of Cell division

Sexual reproduction? No problem!
In sexual reproduction two haploid gametes come together to make a ZYGOTE. This then undergoes MITOSIS to create new cell in the FOETUS.
Crossing over?
This is when the __________ses in the parents have g___es that can change from side to side. This is called re______t genes. When this happens, completely original chromosomes are made. Thats why you look like your brother or sister....but you also don't!
Meiosis
Meiosis is a different kind of cell division. It is used to produce male and female gametes. A human body cell contains 46 chromosomes (DIPLOID) arranged in 23 pairs. The gametes are sperm or eggs, and only contain half as many chromosomes (23) (HAPLOID). This is why meiosis is sometimes called reduction division.
Mitosis
Mitosis is a type of cell division. Mitosis occurs wherever more cells are needed. It produces two new cells that are identical to each other, and to the parent cell. The process of growth and division is called the cell cycle.
The cycle starts as the number of organelles - the different parts of the cell - increases. This is to ensure that each of the two new cells receives copies of all the organelles.
Cell division
Now:
To know how cells reproduce themselves
To know the basics of reproduction
Aim
Wednesday the 3rd February
Stick the pictures in!
Have a go at P. 70 questions 7-10
Homework
Find out WHY:

a. There are half BOYS and HALF girls
b. What did MENDEL do?
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