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AP Biology: Evolution Drives the Diversity and Unity of Life Drill 1, Problem 4. Hardy-Weinberg equilibrium requires that a population meet all of the following criteria except what?
Transcript
- 00:03
Here's an unshmoopy question for ya.
- 00:06
Hardy-Weinberg equilibrium requires that a population meet all of the following criteria
- 00:12
EXCEPT... what? And here are the potential answers...
- 00:18
EXCEPT. Make sure you've read the question carefully because that EXCEPT word always
- 00:24
comes back and bites us.
Full Transcript
- 00:26
This question asks us about the Hardy-Weinberg equilibrium.
- 00:29
While it may sound like a merger between a couple of boy sleuths and a Hollywood agent...
- 00:33
...the Hardy-Weinberg equilibrium is actually a really important principle in evolution.
- 00:38
It states that from one generation to the next, the genetic variation in a population
- 00:44
will remain constant....under a few conditions.
- 00:47
Here's a mnemonic that'll help us remember what the conditions are for a Hardy-Weinberg population.
- 00:54
Large Maggie Moo Really Sleeps.
- 00:58
It stands for...Large, Mutations, Migration, Random-mating, Selection.
- 01:07
L for Large: The population is infinitely large... so A is true. We can cross that one off.
- 01:13
M for: mutations are not occurring. Nope, not in our answer choices.
- 01:18
M for: migration is not occurring in or out of the population. That one looks like D....but
- 01:24
let's make sure...
- 01:25
R for: random mating occurs...meaning B is true...cross that one off.
- 01:32
And S for: natural selection isn't occurring. We can cross off C, too.
- 01:38
Since we've gone through the entire mnemonic, it looks like migration should NOT occur for
- 01:43
the conditions of Hardy-Weinberg equilibrium. This makes a lot of sense, because if the
- 01:47
organisms in a population kept migrating and mating in and out of the population...
- 01:52
...it'd be really hard to keep equilibrium of the genetic variation in a population.
- 01:57
D's our answer. This answer explanation is now over, but we're
- 02:00
Hardly-Whining.
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