Evolution Basics Which of the following things are likely to...

Evolution Basics Which of the following things are likely to cause evolution in a population? Try to keep all causes of evolution in mind. A flood washes away 3/4 of a population of ground squirrels. Individuals migrate between 2 populations that have the same gene pool. A mutation introduces a new wing color in a group of butterflies. The thickness in fur coat for particular small mammal is determined by the average temperature in its environment. Over time, the environment gets warmer. Within a lizard population, there is genetic variation in the length of the tail. The neighborhood cats chase the lizaards, and have an easier time catching the ones with long tails.

Transcript

00:01 When we want to compare to similar populations or just know that, you know, why the allelic and genotypic frequencies of a population are changing, why they're not an equilibrium or why it keeps altering, there's a few major things that we can look at.

00:17 One of the first things you want to observe, especially if we're looking at two distinct places and why they're different, even though they seem like they should be centered, similar, is environmental.

00:30 Influences.

00:35 So environmental influences, this can be a lot of like survival of the fittest, you know, what traits and phenotypes are most productive to the environment, or maybe there's a lot of geographic isolation that can change the populations, but that's definitely something we're going to look at.

00:55 Another thing would be natural selection.

01:03 Again, maybe certain alleles or certain phenotypes are better suited to a particular environment or to a particular situation, and that can alter the equilibrium and the allelic frequencies.

01:18 Something else that's a big part when you're comparing two different places or just watching a population change and shift is migration.

01:30 So this is both immigration of people coming in and emigration of people going out.

01:38 So every time a person comes in or goes out, they are taking their alleles with them, and so they're changing the gene pool for that particular population.

01:47 Usually, migration is a small part of genetic drift and gene flow.

01:54 However, it is still a part of it.

01:58 You can also have random mutations that will change the gene pool for a population.

02:06 There might be a new allele that rises and it might not last long.

02:10 Probably will not last long, but it might...

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