AP Biology 3.3 Evolution
AP Biology 3.3 Evolution. What is a small population of organisms prone to?
|Test Prep||AP Biology|
A small population of organisms is prone to...what?
And here are the potential answers
Let's start at the very beginning. [Caveman starting a fire]
We hear it's a very good place to start.
Mutation is a natural process that changes a DNA sequence and the precise order of nucleotides
within a DNA molecule.
It's also the reason why it's safe to say that no two people are alike. [Two guys take off their hats]
So all this time you've called your little brother a mutant?
You're not too far off base. [Family sitting down for dinner]
Random genetic changes have little or no effect on a small population of organisms making
Moving on to “B,” nonrandom mating. [A couple kissing]
Nonrandom mating occurs within organisms when there are plenty of potential mates to choose
It's provides the opportunity within a large gene pool to pick out a mate based on compatibility, [A large swimming pool]
or desirable traits.
In a small population, there’s no chance to pick and choose.
All you can do is hope your mate likes death metal, because it’s all random selection. [Man picking a mate]
All of this means that “B” is the wrong answer.
How about D, high migration rates?
Well, there's nothing that indicates that a small population has any more desire to
pick up and move than a larger population would. [Baby deer prancing in a field]
That's not to say it wouldn't happen given the right circumstance.
Sometimes you end up with high rent, or irritating neighbors.
So while a small population may be prone to migration, it is not prone to high migration
rates, which means answer “D” is incorrect.
Which leaves us with “C”.
Genetic drift is the change in the frequency of a gene variant. [Graph depicting change in frequency of a gene variant]
The smaller the population, the more susceptible it is to dramatic changes in gene frequencies.
In other words, genetic drift can determine whether an individual within a small population
reproduces or even survives.
Genetic drift can have a large impact on a very small population, meaning that C is the
Stop tweeting about corn. [Man tweeting about corn on his mobile]
No one should care this much about corn. Seriously, come on people.