00:01
This question asked about what the term fitness really relates to.
00:04
And a lot of our common definitions of the word evolutionary fitness do involve things like the ability to reproduce.
00:11
And it can be confusing to think about this.
00:12
Well, right, are we talking about the ability of somebody to reproduce or what actually is reproduced in large populations? and do we mean like every phenotype combination that has the same traits? or do we mean only certain genotypes, right? like if i'm heterozygous, do i count the same as someone that's homozygous? all right.
00:37
So let me pull up another resource to think about this mathematically.
00:40
So this is an example of a more of a mathematical equation.
00:44
But the answer to your question is that fitness is going to be calculated and related to, and i'm just going back to this so it's a little easier to understand.
00:54
And fitness is going to be related to the amount of offspring that are produced for individuals, the relative amount of offspring for individuals of each genotype.
01:07
So each genotype has its own fitness.
01:11
And so to use this as an example, we could think about each one of these genotypes having its own fitness.
01:16
And so this might be the start of our population before selection, but maybe after selection, maybe this homozygous dominant doesn't actually, doesn't really have much selection.
01:32
So that's, or much, sorry, doesn't have that much will to reproduce, maybe, let's just say.
01:38
And that's going to drop down to 24 people in that population...