BIOLOGY 1M03 Lecture 4: BIOLOGY 1M03 Chapter 25 Part 2
6 Oct 2016
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Biology 1m03- chapter 25 evolutionary processes part 2. Research on genetic drift in small fruit fly populations involved a genetic marker, the gene for leg-bristle morphology. This gene has two alleles, one resulting in straight leg (wild-type) bristles and the other in forked (bent) bristles. In 70 among 96 (n= 8, p= 0. 5, s= 1) populations studied, genetic drift caused one allele to be lost. In the lab, genetic drift was found to decrease genetic variation within populations and increase genetic differences between populations. Genetic drift is of great concern to conservation biologists because the small populations found on nature reserves or in zoos are especially susceptible to it. Genetic drift can be caused by any event or process that involves sampling error, not just the sampling of gametes that occurs during fertilization. Founder effect on the green iguanas of anguilla. A founder event occurs when a group emigrates to a new area and starts a new population.
