Biology, 03.11.2020 17:20 nothingworksoutforme

A mouse geneticist selected for increased 12-day litter weight (total weight of a litter of offspring 12 days after birth) in a population of mice. The 12-day litter weight of the population steadily increased but then leveled off after about 17 generations. At generation 17, the geneticist took one family of mice from the selected population and reversed the selection procedure: in this group, he selected for decreased 12-day litter size. This group immediately responded to decreased selection; the 12-day litter weight dropped 4.8 g within one generation and dropped 7.3 g after 5 generations. On the basis of the results of the reverse selection, what is the most likely explanation for the leveling off of 12-day litter weight in the original population

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A mouse geneticist selected for increased 12-day litter weight (total weight of a litter of offsprin...

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