00:01
Okay, so infants birth weights, it said, exist within a narrow range.
00:06
And this is actually, the narrow range is sort of right in the middle of the typical birth weights that we see for kids.
00:15
This being very low birth weights, this being very high birth weights.
00:19
So this is an example of stabilizing selection.
00:24
And in stabilizing selection, the sort of the median phenotype is selected for.
00:30
So what happens with babies with very low birth weight? they have a lower chance to survive.
00:41
Same thing with individuals with very high birth rates.
00:45
They have a lower chance of surviving, maybe from a traumatic birth or something.
00:52
Meanwhile, the babies that are kind of right in this center area, just have a much higher chance of survival than infants with low birth weights or very high birth weights, and that's what stabilized selection means...