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AP Biology 2.5 Evolution 8 Views


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Description:

AP Biology 2.5 Evolution. These features might be anatomically similar but could have different functions.

Language:
English Language

Transcript

00:04

Here’s your Shmoop du jour, brought to you by anatomy. [Man with Chucknorris's face working out]

00:07

Nobody possesses a perfect one, but Chuck Norris is pretty darn close.

00:12

Take a look at the following statement: These features might be anatomically similar but

00:16

could have different functions.

00:18

And here are the possible answers: Well we can knock C off the list right away.

00:26

Vestigiality refers to organisms that have retained organs which have lost their original

00:30

functions.

00:32

And vestigial organs aren't always necessarily organs [A boy with a magnifying glass looking at his arm]

00:35

Ever wonder why you get goosebumps?

00:36

Way back when, when humans needed to scare off predators, they would raise their body [Caveman and animal predators appear]

00:42

hair to appear larger.

00:44

Nowadays we have other ways of dealing with predators.

00:47

Like lightsabers.

00:49

But since vestigial essentially means functionless, we can eliminate “C”. [Man in black robes with a lightsaber polnts to answer C]

00:53

What about “D”?

00:54

Does comparative embryology have anything to do with functioning features?

00:58

Ehhh...not really. [Two eggs and one cracks and a chick appears]

01:01

Comparative embryology studies look at how animal life is related

01:04

...or not related. [An egg cracks and a cow appears]

01:06

Nothing to do with what our question is asking.

01:08

“D” is out.

01:09

B isn't our answer either.

01:11

Biography is the study of how species and ecosystems are distributed throughout our [Animals and plants on the Earth spinning around]

01:17

world.

01:18

It's the reason why polar bears aren't surfing in Malibu right now... [A polar bear holding a surfboard]

01:20

...and why you can’t have a pineapple tree in North Dakota.

01:24

So we can get rid of B. That leaves “A.” Homologous structures

01:27

are anatomically similar, but could have different functions.

01:31

Think about the femur for a second. [A human and horse in the woods]

01:33

Our femur may be anatomically similar to a horse's, but they serve slightly different

01:38

functions.

01:39

A thoroughbred can reach 35 to 40 miles per hour,

01:42

While some Shmoopers can barely make it to 3rd period math on time. [Student late for class and teacher yells]

01:48

So “A” is our correct answer.

01:49

Maybe one day we'll find a human with a superior femur. [Chucknorris running through the forest]

01:53

...Maybe we already have.

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