Question

The questions about mechanism of evolution

1. If you send a sample of your cheek cells to the company 23andMeTM, they will tell you your genetic ancestry. This is possible because certain alleles are associated with certain historic human populations (eg, GATTC in a particular location might be associated with Han Chinese ancestry). Most of the allele differences have no effect on phenotype. The table below lists four mechanisms of evolution. For each mechanism, circle and explain whether you think it was involved in the process that made different human populations associated with these different alleles. (16 pts) mechanism involved? (circle one) Explain your reasoning. likely selection unlikely likely mutation unlikely likely gene flow unlikely likely drift unlikely

Answer 1

mechanism	involved?	explain your reasoning
selection	likely	selection in other words is a differential reproduction.In this based on variability and fertility certain genotypes are selected. As these mutant ones in homozygous condition mostly haven't got any advantage on the environment, normally they aren't selected. but they will be most likely to be present in the heterozygotes. this systematic process thus can cause change in the gene and genotype frequencies and thus can contribute to the evolution.
mutation	likely	muttion refers to sudden heritable change within the gene. this can cause evolution in a more likely way than the selection. because entirely a new allele is been added to the population and this sytematic process changes the gene and genotype frequencies of the population from generation to generation.
gene flow	likely	In other words it can be also called migration, refers to inflow or outflow of new alleles, iin which the gene and genotype frequencies changes. this introduction of new aleles thus can cause evolution.
drift	likely	it is a dispersive process occurs in a small population. this can cause random flutuations in the gene and genotype frequencies and thus can lead to evolution.