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8 Cards in this Set
- Front
- Back
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When can genes on the same chromosome show independent assortment? |
When they are far away from each other on the chromasome |
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What is incomplete linkage? |
Genes are on the same chromosome but capable of swapping alleles during meiosis (recombination) |
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Give an example of incomplete linkage in drosophilia |
Miniature (m) and White (w) genes |
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At what stage during meiosis does crossing over occur? |
Prophase I |
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What is a chiasmata? |
The structure formed when chromosomes cross over each other and swap genetic material |
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What can be the effect of two cross overs on the markers? |
Two cross overs can effectively undo the effect of the first marker |
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What is the effect of undoing the effect at the first marker on the genetic map? |
Underestimation of the true distance between gene markers |
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Why are map distances not a representation of physical distances on a chromosome? |
Recombination 'hot spots' can lead to an over estimation of the physical distances
Low recombination rates (e.g. in heterochromatin) can lead to underestimation of the physical distance |
