A biologist raised 100 populations of flies in a lab. At the beginning of the ex

Question

A biologist raised 100 populations of flies in a lab. At the beginning of the experiment, each population had 16 flies: 8 with plain wings and 8 with striped wings. These 16 flies reproduced to form the first generation of offspring. In each of the 100 populations, the biologist randomly chose 16 of the offspring as breeders for the next generation. She repeated this process for 20 generations. At the end of the experiment, half of the populations contained only plainwinged flies, and the other half contained only stripedwing flies. Wing pattern is a genetically controlled trait that does not affect how well flies survive or reproduce. What is the most likely explanation for the observed change in wing type among flies over time? * A) The small number of individuals reproducing each generation contributed to the rapid changes in the frequency of the two wing types in these populations. B) The experiment did not control for all the variables, so the environments were different enough that natural selection contributed to the changes in the frequency of the two wing types in these populations A biologist raised 100 populations of flies in a lab. At the beginning of the experiment, each population had 16 flies: 8 with plain wings and 8 with striped wings. These 16 flies reproduced to form the first generation of offspring. In each of the 100 populations, the biologist randomly chose 16 of the offspring as breeders for the next generation. She repeated this process for 20 generations. At the end of the experiment, half of the populations contained only plainwinged flies, and the other half contained only stripedwing flies. Wing pattern is a genetically controlled trait that does not affect how well flies survive or reproduce. What is the most likely explanation for the observed change in wing type among flies over time? * A) The small number of individuals reproducing each generation contributed to the rapid changes in the frequency of the two wing types in these populations. B) The experiment did not control for all the variables, so the environments were different enough that natural selection contributed to the changes in the frequency of the two wing types in these populations A biologist raised 100 populations of flies in a lab. At the beginning of the experiment, each population had 16 flies: 8 with plain wings and 8 with striped wings. These 16 flies reproduced to form the first generation of offspring. In each of the 100 populations, the biologist randomly chose 16 of the offspring as breeders for the next generation. She repeated this process for 20 generations. At the end of the experiment, half of the populations contained only plainwinged flies, and the other half contained only stripedwing flies. Wing pattern is a genetically controlled trait that does not affect how well flies survive or reproduce. What is the most likely explanation for the observed change in wing type among flies over time? * A) The small number of individuals reproducing each generation contributed to the rapid changes in the frequency of the two wing types in these populations. B) The experiment did not control for all the variables, so the environments were different enough that natural selection contributed to the changes in the frequency of the two wing types in these populations

Explanation / Answer

Ans is A. The small number of individuals in reproductive isolation show rapid changes in allele frequency and this phenomenon is called genetic drift. This phenomenon is totally independent of mutation and general selection. The net effect of genetic drift is rapid evolution.

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