00:01
Okay, polygenic inheritance tells us that many genes add to variation in a trait.
00:07
Each one just adds a small amount of variation.
00:11
So like our p's only had two alleles of one gene.
00:15
So obviously with polygenic inheritance, you can have a lot more variation in a population.
00:19
And one really easy example of this is height in humans, where you have this huge spread.
00:24
And each person just varies a tiny bit in their height.
00:29
And so if we think about a tall dad and a short mom, they had kids, their first generation of children would probably fall somewhere in between them heightwise.
00:39
And so that could be the answer to this question.
00:42
But let's see if there's a better answer.
00:44
Well, qualitative variation occurs when you just have two possible options.
00:50
And this is usually when a trait is just coated by one gene that has two alleles.
00:56
So for peas, they could either be green or yellow...