polar bears after their split with t were different between brown some of the di

Question

polar bears after their split with t were different between brown some of the differences between variation within polar bear popu Figure 13.13 s to fixation, carrying with theminto a distinct s ation may be needed to maintain500,000 years ago. tion (along with other measures from brown bears, consistent with their rapid adap isolated in the Arctic. erienced stronger selection than Polar bears evolved isolated in the Arctic. Yet even after adapting to their new habitat, they continued to interbreed with brown in polar bears gene, for example, called APOB, lar bears. The result was sporadic gene flow. (Adapted from Liu et al. 2014.) 123,000 900 p- pe eir 800- 700 11C- 600- ed of k. th E 20,000 500 400 300 ?? ?? rs ay, 200 he 100 nd to > 463,000 68,000 s. Brown Polar an

Explanation / Answer

As, the question is saying “gene flow has travelled only one way , from polar bears to brown bears” it means that is the movement or flow of gene or allele from one population to other population of the same that can breed. It means gene migration is occurring from polar beer to brown bears as the two are breeding. As, brown bear are shifted to the condition like cold climatic condition, where polar bears are best suited because of their genes present to survive in those condition. It is used in spreading of traits from polar beer to brown beer so that it can have new genes to best suited with environment. This gene flow occur as brown beers are migrated to the environment where polar beer is residing for long. Hence, their genes are best to that environment. Hence, flow of gene is only in one direction.

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