Genetics and Evolution-Linkage and recombination

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  • Created by: jessica
  • Created on: 06-02-13 13:52
If genes are on different chromosomes what do they show?
Independent assortment
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If genes are on the same chromosomes do they show independent assortment?
If they are far apart on the chromosome they can still show independent assortment. If they are closer together they may not be inherited independently.
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What is recombination?
When homologous chromosomes can exchange sections a.k.a crossing over
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What are genetic maps based on?
measures of distance between loci.Big physical distance=more likely to cross over
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When does independent assortment occur?
When genes are:on different chromosomes and are sufficiently far apart for recombination to be as likely as no recombination
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What is independent assortment equivalent to?
Recombination frequency of 50%.
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How are recombination frequencies affected by distance between genes?
Genes on the same chromosome exhibit linkage giving rise to recombinative frequencies that are less than 50%.
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When do multiple cross overs occur?
With map distances greater than 10cM.
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What do recombination hotspots overestimate?
Physical distance along a chromosome.
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What are the two types of genetic map?
Recombination and physcial. Used together to give a better understanding.
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What are linked genes?
The loci of the genes are on the same chromosome
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What are the two conformations of linked genes in a dihybrid?
Cis or trans.
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What is the symbolism for cis conformation?
AB/ab or ++/ab
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What is the symbolism for trans conformation?
Ab/aB or +b/a+
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Other cards in this set

Card 2

Front

If genes are on the same chromosomes do they show independent assortment?

Back

If they are far apart on the chromosome they can still show independent assortment. If they are closer together they may not be inherited independently.

Card 3

Front

What is recombination?

Back

Preview of the front of card 3

Card 4

Front

What are genetic maps based on?

Back

Preview of the front of card 4

Card 5

Front

When does independent assortment occur?

Back

Preview of the front of card 5
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