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Hanane ElSayed

on 29 March 2015

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Transcript of Bio-10.3

Gene linkage and Polyploidy Chapter 10, lesson 3 Gene Linkage Chromosome maps Genetic Recombination A new set of genes is produced by:
1. Crossing over: Infinite number of possibilities.
2. Independent assortment: 2 * (2 to the power 23) = almost 70 trillion Genes that are close on a chromosome are expected to travel together (an exception to mendel's law)

Found using studies on Drosophila melanogaster. 1. Shows sequence of genes.
2. Found by studying crossing over.
3. They give approximate positions, not actual distances. One map unit = 1% separation during crossing over

Therefore, more distance = more map units = higher frequency of being separated during crossing over Frequency of crossing over When an organism has more than two copies of chromosomes

examples: earthworms, goldfish, wheat, oats, sugar cane (big size plants)

Polyploidy in humans is lethal. Polyploidy
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