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AysviL [449]
2 years ago
8

SOMEONE I NEED HELP!!!!!!!!!!!!

Biology
1 answer:
iren2701 [21]2 years ago
3 0

Answer:

sorry cant help u:((((((((

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How does the recesive sickle-cell allele stay in the gene pool
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Because natural selection selects for it. Thus it persists.

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You have to understand heterozygote advantage. Basically, it's where heterozygotes have an advantage over homozygotes. In the case of sickle cell disease, heterozygotes have an advantage, and natural selection favors whatever is advantageous. Thus, because heterozygotes each have one recessive sickle-cell allele, as natural selection favors the heterozygotes, the recessive sickle-cell allele persists and remains in the gene pool.

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The brain contains billions of interconnected neurons and glia. <span> Glia cells</span><span> enclosed the  neurons and provide support for and insulation between them. It  is also the most abundant </span>cell types in the central nervous system. While Neurons are the basic units of the nervous system and it is the most important part is the brain. 

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