00:01
Which of these is homologous to the bones in the flipper of a dolphin? the rays of a fin in a fish, a wing of a fly, the vestigal hind leg bones of a whale, or the bones in the arm of a thawks.
00:14
So homologous means the traits are similar, and they're similar because they've been inherited from a common ancestor.
00:24
Inherited from a common ancestor.
00:27
And this is different to analogous.
00:29
Analogous traits are similar, but they've, evolved independently.
00:34
So they are similar because of similar evolutionary pressures.
00:41
So what this means is, if you look at, for example, the wings of a bird and the wings of a bat, they didn't inherit those wings from a common ancestor.
00:50
Their common ancestor didn't have wings.
00:52
They evolved them independently in order to fly.
00:55
So they look similar because they both use to fly.
00:59
And that would be analogous.
01:00
So we're looking at something that's homologous...