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Home Q & A Board Biology-Related Homework Help General Biology
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RibosomePoo RibosomePoo
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12 years ago
When a population is in Hardy-Weinberg equilibrium, the allele frequencies are not changing.

But look at this:

What about an example where disruptive selection favours homozygotes instead of heterozygotes, so the phenotypic frequencies change but the allele frequencies are the same.

Is the population in HWE?
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wrote...
#1
Educator
12 years ago
So, hypothetically, BB is favoured over Bb?
RibosomePoo Author
wrote...
#2
12 years ago
Quote from: bio_man (12 years ago)
So, hypothetically, BB is favoured over Bb?

Well, both homozygous frequencies are favoured over heterozygotes.

I just need confirming what HWE is. Does it occur when genotype frequencies change or allele frequencies?


Also, what is the difference between balancing selection and disruptive selection?
wrote...
#3
Educator
12 years ago
Hardy-Weinberg is purely hypothetical. If a population does not undergo changes to their gene pools are not currently evolving – this state is called the Hardy-Weinberg equilibrium. However, populations rarely remain in Hardy-Weinberg equilibrium for long in nature, but the concept is useful because it gives us a baseline value to compare to if there is a change in the gene pool.

Natural selection, sexual selection, artificial selection, genetic drift, and gene flow disrupt the Hardy-Weinberg equilibrium.
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