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Unformatted text preview: Percentage of recombinants is proportional to Yellow is at If cross yellow and sable body, get Sable V white eye Crossveinless wings unit of a centimorgan (cM): idea of a genetic map (aka meiotic map): II. Sources of genetic variation 1. Independent assortment of maternal and paternal chromosomes • if n = , how many different gametes in terms of different combinations of maternal and paternal chromosomes? • 2 n different gametes possible 2. Crossing over • routinely occurs multiple times • produces new combinations of 3. Outcrossing (vs. self-fertilization) Outcrossing = combine haploid genomes from different parents to form diploid offspring • potentially, new combinations of alleles 4. Mutation Are mutations frequent enough to generate significant genetic variation? Based on estimates of frequency of mutation per gene and number of genes in human genome, calculate that each human gamete carries an average of mutations....
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- Fall '07
- Biology, A. Morgan, paternal chromosomes, linkage mapping A., linkage mapping Percentage