Meiosis Revision.

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  • Created by: ElishaG
  • Created on: 21-02-17 19:53
When is genetic variation created in meiosis?
1)Prophase 1, crossing over of homologous chromosomes.2)Metaphase 1-Independent assortment of chromosomes.3)Metaphase 2- Independent assortment of recombinant chromosomes.
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What is haploid?
1)Cells with one set of chromosomes (n).2)Chromosomes in pairs.
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What is diploid?
1)Cells containing two sets of chromosomes (2n).2)Chromosomes in pairs.
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Describe Interphase I.
1)DNA doubles, chromatids replicate by semi-conservative replication.2)Individual chromosomes invisible.3)Organelles replicate.4)More ATP.5)Cells increase in size.
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What would Interphase I look like through a microscope?
Would just see nucleus.
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Describe Prophase I.
1)Chromosomes condense,become visible.2)Homologous chromosomes join,form bivalent.3)Crossing over occurs, variation occurs.4)Centrioles move to opposite poles.5)Spindle fibres form, nuclear envelope disapears.
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What is the cross over point called?
Chiasmata.
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What would prophase I look like through a microscope?
Chromosomes crossed over.
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Describe Metaphase I.
1)Bivalents line along equator.2)Centromere attach to centriole via spindle fibres.3)Independent assortment occurs, results in genetic variation.
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What would Metaphase I look like through a microscope?
Chromosomes lined in Middle of cell.
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Describe Anaphase I.
1)Homologous chromsomes separate.2)Spindle fires contract and shorten.
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What would Anaphase I look like through a microscope?
Looks like spiders legs but in four separate areas.
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Describe Telophase I.
1)Chromosomes reach poles of cells.2)Nuclear envelope may form around new nuclei.
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What would Telophase I look like through a microscope?
Four areas of chromosomes, nuclear envelope around them, (two envelopes around 4 chromosomes).
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Describe Cytokinesis I.
1)Individual chromosomes remain visible.2)Cytoplasm contricts.3)Two daughter cells formed that are genetically different and diploid.
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What would Cytokinesis I look like through a microscope?
Two cells visible.
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Describe Interphase II.
1)Short.2)No DNA replication.3)Chromosomes remain visible.
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Describe Prophase II.
1)Centrioles replicate,move to opposite poles but at right angles to first.2)Spindle fibres form.3)Nuclear envelope disappears.
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What would Prophase II look like through a microscope?
Chromosomes visible in centre of each daughter cell.
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Describe Metaphase II.
1)Chromosomes align at equator of cell.2)Independent assortment-results in genetic variation.
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What would Metaphase II look like through a microscope?
Chromosomes in Middle of each daughter cell.
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Describe Anaphase II.
1)Centromere splits.2)Chromatids pulled to opposite poles.2)Spindle fibres contract and shorten.
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What would Anaphase II look like through a microscope?
Like spiders legs on each side of the daughter cells.
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Describe Telophase II.
1)Chromatids reach poles and become chromosomes.2)Chromosomes de-condense.
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What would Telophase II look like through a microscope?
Chromosomes in each corner of the daughter cells.
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Describe Cytokinesis II.
1)Individual chromosomes are invisible.2)Cytoplasm constricts.3)Four genetically different daughter cells formed.
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What would Cytokinesis II look like through a microscope?
Four individual daughter cells.
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Card 2

Front

What is haploid?

Back

1)Cells with one set of chromosomes (n).2)Chromosomes in pairs.

Card 3

Front

What is diploid?

Back

Preview of the front of card 3

Card 4

Front

Describe Interphase I.

Back

Preview of the front of card 4

Card 5

Front

What would Interphase I look like through a microscope?

Back

Preview of the front of card 5
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