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Transcript of Bio-10.3
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