00:01
So the question is asking us how selection occurs in the actual process of natural selection.
00:06
So we'll again examine this question using darwin's finches on the galapagos.
00:14
So you have finches on the galapagos that are breeding and producing offspring.
00:22
More often than not, the offspring of these finches tend to have the same beak size.
00:30
As the parent, but some will have their beak a little bit larger, and some will have the beak a little bit smaller.
00:41
And you can assume that this is true for all finches on the islands.
00:45
So then what you end up getting is this distribution of all finches on the galapagos, where a minority have small beaks, another minority have large beaks but most of the finches have average sized beaks and recall in the text it was mentioned that during dry seasons on the islands plants produce large tough seeds and these seeds confer a difficulty for the finches depending on their beak sized these large and tough seeds are easily handled by large beaks, but are difficult to open for small beaks.
01:31
So finches with small beaks are unable to handle these seeds and have lower fitness in dry seasons.
01:45
And in rainy seasons, plants produce small soft seeds.
01:51
And these small soft seeds are easily hand...