Chapter 7 - Chapter 7 February 10th Linkage Figure 7.6 o...

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Chapter 7 February 10 th Linkage Figure 7.6 o Genes A/B are on the same chromosome do not show independent assortment o The top no crossing over The alleles of the parent stay together all the time (same molecule) o There is a cutting/pasting of DNA, a portion of the paternal chromosome is joined with maternal chromosome occurs in meiosis Genes on the same chromosome LINKED Same molecule therefore covalently linked because the backbone of DNA is covalent bonds Recombination/Crossing Over/ Linked Genes AaBb A A a a Ab/aB 1. linked b b B B 2. AAbb X aaBB Ab Ab aB aB (AaBb) 20% A(blue) a(red) A(blue) (crosses over) a (red) b (blue) b (blue) B (red) B (red) 3. “20% recombination” a (red) A (blue) b (blue) B (red) Ab ab AB aB 40% 10% 10% 40% If one chromosomes crosses over another, ___ (involves a pair of chromosomes) Recombination is a rare process o Genes that are linked, the allele combinations tend to stay together
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This note was uploaded on 09/22/2009 for the course BIOL 2004 taught by Professor Jofalkinham during the Spring '08 term at Virginia Tech.

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Chapter 7 - Chapter 7 February 10th Linkage Figure 7.6 o...

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