Meiosis

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  • Created by: mollsbea
  • Created on: 01-05-17 10:19
How many chromatids does Prophase 1 have?
Two sister chromatids joined by a centromere.
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What happens to the chromosomes in Prophase 1?
They condense, giving a shorter and thicker appearance.
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What happens to the nuclear envelope and centriole in Prophase 1?
The nuclear envelope breaks down. The centriole divides and two centrioles move to opposite poles of the cell.
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What is the spindle fibre made from?
Tubulin.
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What happens to the homologous chromosomes in Prophase 1?
The homologous chromosomes pair up with crossing over occurring where non-sister chromatids exchange sections of DNA with one another.
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What do the homologous chromosomes do in Metaphase 1?
They line up on the enclose of the cell, attaching to the spindle fibres by their centromeres.
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What is independent assortment in Metaphase 1?
When the homologous chromosomes line up on the equator randomly.
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What happens to the individual chromosomes (homologous pairs) in Anaphase 1?
They are pulled apart but the centromere does not divide so the chromosome still consists of two sister chromatids.
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What happens due to the crossing over in Anaphase 1?
Sections of DNA have been exchanged between homologous chromosomes.
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What do motor proteins do in Anaphase 1?
Walk along the spindle fibres in opposite directions to pull the homologous chromosomes apart.
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What is independent segregation in Anaphase 1?
When the chromosomes are pulled to opposite sides of the cell randomly.
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What happens to the chromosomes and nuclear envelope in Telophase 1?
The chromosomes reach opposite ends of the pole andf the nuclear envelope forms around each set of chromosomes.
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How many chromatids do the chromosomes consist of in Prophase 2?
The chromosomes consist of two chromatids joined by a centromere.
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Why may the chromatids no longer be identical in Prophase 2?
Due to the crossing over which occurred in Prophase 1.
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What happens to the chromosomes, nuclear envelope, centrioles and spindles in Prophase 2?
The chromosomes condense, the nuclear envelope breaks down, the centrioles divides moving to opposite ends of the cell) and the spindle forms.
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What happens to the chromosomes in Metaphase 2?
Chromosomes line up on equator and attached by their centromeres to the spindle.
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What happens to the chromatids in Metaphase 2?
They arrange themselves randomly on the equator.
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What happens in Anaphase 2?
The same as Anaphase 1.
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What happens to the chromosomes and nuclear envelope in Telophase 2?
The chromosomes reach the opposite poles and a nuclear envelope forms around the four sets.
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Are the four nuclei identical in Telophase 2?
No, they are all haploid but not generically identical.
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Other cards in this set

Card 2

Front

They condense, giving a shorter and thicker appearance.

Back

What happens to the chromosomes in Prophase 1?

Card 3

Front

The nuclear envelope breaks down. The centriole divides and two centrioles move to opposite poles of the cell.

Back

Preview of the back of card 3

Card 4

Front

Tubulin.

Back

Preview of the back of card 4

Card 5

Front

The homologous chromosomes pair up with crossing over occurring where non-sister chromatids exchange sections of DNA with one another.

Back

Preview of the back of card 5
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