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Andru [333]
3 years ago
12

What are the mechanisms of natural selection, and how do they lead to changes in

Biology
1 answer:
Nata [24]3 years ago
5 0

Darwin's proposed mechanism for evolution is natural selection. Natural selection allows species to respond to their surroundings through time, or to become progressively excellently-suited. Natural selection is environmentally based and involves established heritable variation within a population.

They lead to changes in  species over time:

  • Darwin suggested species will evolve over time, new species originate from pre-existing species, and all species share a common ancestor with each other.
  • In this framework each organism has its own special set of heritable i.e genetic variations from the common ancestor that have slowly developed over very longer periods of time.
  • Parroted branching activities that isolate new species from a common ancestor create a multi-level tree that connects all living organisms.
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Answer:

Because natural selection selects for it. Thus it persists.

Explanation:

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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