00:01
All right, so we're going to address the question that asks about heart disease, whether or not it is a threshold trait and what factors may influence someone to develop heart disease.
00:14
And so let's actually kind of address that second part of the question first that kind of asks about genetic and environmental factors, factors that may influence heart disease.
00:25
And so before we go into the actual things that influence heart disease, let's kind of define what liability.
00:31
Is because that's one of the key terms in this question.
00:34
And so liability is basically going to be these underlying risk factors that contribute to developing the disease.
00:44
And so both liability and threshold trait kind of go hand in hand together in that if the threshold trade is going to be kind of like a, let's say, a minimum of something or some combination of factors.
01:03
Once you kind of go over that line or the threshold trait, you can develop the disease or you will develop the disease.
01:12
So basically a lot of geneticists theorize that when the liability exceeds a certain level or threshold, the trait will appear, in this case, heart disease.
01:22
So that's kind of what is or what a threshold trait and what liability is for this particular disease.
01:29
And so heart disease.
01:31
Disease, kind of going back to the first part of the question, heart disease is going to be considered a threshold trade.
01:37
And so on the whiteboard here, i'll just draw a little example of a threshold trait.
01:44
So say we have a certain bar here, and this red line will be the, it's kind of rough, sorry, this red line here will be the threshold for heart disease.
02:01
Now, going back to the second part of the question, it asks kind of what environmental factors or genetic factors might influence heart disease in the first place.
02:12
And so some of these factors are going to be like diet.
02:17
So i'll kind of fill in the bar here...