00:01
In the question, it is given about the analogy and homology, which are the important aspect of comparing species.
00:10
Homologous traits are the traits which are derived from the same source.
00:15
Whereas analogous traits are going to perform the similar function, but they are not derived from the same source.
00:25
They are not derived from the same source.
00:29
Okay, means they are differently derived.
00:32
Now there are some examples given in the question we need to check whether the trait here is analogous or homologous.
00:41
Okay, first is a dorsal fin of a porpoise and salmon.
00:48
So this dorsal fin and dorsal fin of porpoise and salmon are actually analogous structure.
00:57
These are analogous structure because they serve i mean they come from a different they serve the same function but they come from a different source that is because porpoise is a mammal whereas salmon comes under fish category that is why their sources are different but the structure is similar and they do the similar function so when they are evolutionary and developmentally different from each other, the trait will be analogous.
01:40
But when they are derived from the same source evolutionarily and developmentally, the trait would be homologous.
01:47
Now going further, flippers of porpoise and dorsal spin of salmon.
01:54
Now these, even though if they are having the different purposes, still the trait is been derived from a tetrapore.
02:07
The fish and the mammal both have derived their trait from tetrapod.
02:14
Therefore, these trait become homologous.
02:19
Okay.
02:20
Further, jointed leg of ladybird, bittle and robin...