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why A1 allele become not fixed in the population when  the A2 allele is still present in...

why A1 allele become not fixed in the population when  the A2 allele is still present in this population?

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Answer #1

Some allele which are deleterious and harmful to organism which carry them can be eliminated by natural selection as those individual will be dead due to expression of this allele and allele can't pass in next generation if individual die before reproducing.

Another allele which can pass in next generation due to reproduction of that organism, will still present in population.

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