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downs syndrome and Replication

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by

Harvey Buckle

on 28 May 2015

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Transcript of downs syndrome and Replication

Downs syndrome and Replication
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.


Homework
Write a description of Meiosis
Aim
To know the causes of Downs syndrome
To know how cells reproduce through meiosis and mitosis
To answer related questions
Starter
What causes Downs syndrome?
The start
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.
Then
Before a cell divides, its chromosomes are copied exactly. The DNA molecule is made of two strands. As each of the two strands separate, new strands are made alongside each of them, thereby making two new copies.
What happens?
Mitosis and meiosis are two ways that cells reproduce.

By mitosis a cell splits to create two identical copies of the original cell.

In meiosis cells split to form new cells with half the usual number of chromosomes, to produce gametes for sexual reproduction.
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