stion 15-6: The United Nations predicts that the human Que global population is
ID: 135770 • Letter: S
Question
stion 15-6: The United Nations predicts that the human Que global population is most likely to stabilize at 9 billion within the next 100 years. If the population level remains at this level for the next 10 KY, what would you predict about the following parameters, compared to today's values? (a) Effective population size. (b) Average heterozygosity (c) The strength of selection required to overcome effects of genetic drift. (d) FsT between populations. Over the same time-scale, the chimpanzee population declines to 400 individuals, and remains stable thereafter. 200 chimpanzees are kept as an interbreeding population across the world's zoos while 200 remain as wild in a nature reserve. In these instances how will the four parameters (a-d) change?Explanation / Answer
Well, population size, Heterozygosity, genetic drift and natural selection all work coupled with each other. Below are your answers
Answer of the question a)
You got to understand that there is a threshold till which the population can grow on earth and it is roughly estimated to about 10 billion and then a decline is estimated. This is indirectly or directly affected by the exhausting resources. So effective population size will only be revolving around the threshold number of 10 billion.
Answer to question b)
Average Heterozygosity is expected to increase as this is affected by the genetic drift. And genetic drift is less in a population that is no more boundary restricted. Migration is easier in today's era and is expected to get better and better leading to a low genetic drift and thus higher Heterozygosity.
Answer to question c)
Natural selection can have a negative effect on genetic drift as the selection supports the sustainibilty of the genes that is fittest as with exhausting resources the variability is less expected. Selection coefficient would be positive leading to a low genetic drift.
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