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natima [27]
3 years ago
7

The fish Astyanax mexicanus has populations in surface lakes and in caves. Cave populations lose their eyes through degeneration

and are unpigmented, while surface populations have normal eyes and pigment. The two groups can form hybrids when mated in the laboratory, but rarely interact in the wild. This is an example of a species currently undergoing hybridization.
A: hybridization.
B: immigration.
C: allopatric speciation.
D: sympatric speciation.
Biology
1 answer:
FinnZ [79.3K]3 years ago
3 0

Answer:

C: allopatric speciation.

Explanation:

Allopatric speciation occurs because a given group has been separated from a parent group, usually because of geographic separation as time goes by. Gene flow is interupted when a population is divideed into geographically isolated subpopulations. It is also referred as geographic speciation.

Extrisic factors-as great distance or a physicl barier prevents two or moe groups from mating.

Various geographical changes can arise such as montains, islands, bodies of water or glaciers.

AS in the above scenario, This is an example of allopatric speciation.

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It is true that it is possible for a population to not evolve for a while.

There is something called the Hardy-Weinberg theorem, which characterizes the distributions of genotype frequencies in populations that are not evolving.

There are 5 Hardy-Weinberg assumptions:

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You can see that some of these are kinda extreme and really hard to get, but with approximations, we can work.

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Concluding, yes, it is possible (but really difficult) for a population to not evolve for a while (at least, in nature), as long as the 5 assumptions above are met.

If you want to learn more, you can read:

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