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AP Bio 3.4 Evolution 38 Views
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Description:
AP Bio 3.4 Evolution. What does gene flow do?
Transcript
- 00:03
Here’s your shmoop du jour, brought to you by gene flow.
- 00:07
It has nothing to do with how awesomely your skinny jeans fit. [Girls in dressing room]
- 00:11
Gene flow does…what?
- 00:13
And here are the potential answers…
- 00:18
Gene flow is like dandelions being blown into your neighbor’s yard because you napped [Person napping on a hammock]
Full Transcript
- 00:23
instead of mowing the lawn like you promised.
- 00:25
When genes migrate, stuff usually…happens.
- 00:28
However, most DNA mutations occur naturally and not because of gene flow. [Man transforms into the Hulk]
- 00:34
When a cell divides, it makes a copy of the DNA.
- 00:36
It’s not entirely like “cut and paste”.
- 00:40
More like “keep your fingers crossed” and hope for a perfect copy. [Girl crossing her fingers]
- 00:44
Otherwise, you have a mutation.
- 00:47
Gene flow is not the culprit here.
- 00:49
So…
- 00:50
Answer “A’ is wrong.
- 00:51
How about “B”?
- 00:52
Well, in the case of human organisms, we normally select mates on a non-random basis… based [Girl flirts with guy sat on a bench]
- 00:57
instead on easily observable traits.
- 00:59
Fortunately, as we mature, more thought will go into the non-random selection process.
- 01:04
It’s all about the vibes.
- 01:05
And not gene flow.
- 01:06
“B” is incorrect.
- 01:08
With natural selection, certain phenotypes are better able than others to contribute [Man bench pressing]
- 01:13
their genes to the next generation.
- 01:14
They’re more fit and uh…pumped up for action. [People working out in a gym]
- 01:18
The end result is a gradual change in the gene frequencies of that population.
- 01:23
None of which is caused by gene flow.
- 01:25
“C” is out.
- 01:26
As for “D”, gene flow is the transfer of alleles from one population to [Alleles transfer from one circle to another]
- 01:31
another.
- 01:32
This transfer knocks the Hardy-Weinberg equilibrium out of whack, because it could change the
- 01:37
allelic frequencies.
- 01:38
And, when those frequencies are the least bit disrupted…well, prepare for some potentially
- 01:43
hairy moments. [Man transforms into a caveman]
- 01:44
“D” is definitely the correct answer.
- 01:46
A word to the wise: you may want to avoid the…deep end of the gene pool… [Man jumps into deep end of a gene pool]
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