AP Biology 2.5 Evolution
AP Biology 2.5 Evolution. These features might be anatomically similar but could have different functions.
|Change in Genetic Makeup||Natural selection|
|Evolve in changing environment||Populations continue to evolve|
Speciation and extinction
|Test Prep||AP Biology|
Vestigiality refers to organisms that have retained organs which have lost their original
And vestigial organs aren't always necessarily organs [A boy with a magnifying glass looking at his arm]
Ever wonder why you get goosebumps?
Way back when, when humans needed to scare off predators, they would raise their body [Caveman and animal predators appear]
hair to appear larger.
Nowadays we have other ways of dealing with predators.
But since vestigial essentially means functionless, we can eliminate “C”. [Man in black robes with a lightsaber polnts to answer C]
What about “D”?
Does comparative embryology have anything to do with functioning features?
Ehhh...not really. [Two eggs and one cracks and a chick appears]
Comparative embryology studies look at how animal life is related
...or not related. [An egg cracks and a cow appears]
Nothing to do with what our question is asking.
“D” is out.
B isn't our answer either.
Biography is the study of how species and ecosystems are distributed throughout our [Animals and plants on the Earth spinning around]
It's the reason why polar bears aren't surfing in Malibu right now... [A polar bear holding a surfboard]
...and why you can’t have a pineapple tree in North Dakota.
So we can get rid of B. That leaves “A.” Homologous structures
are anatomically similar, but could have different functions.
Think about the femur for a second. [A human and horse in the woods]
Our femur may be anatomically similar to a horse's, but they serve slightly different
A thoroughbred can reach 35 to 40 miles per hour,
While some Shmoopers can barely make it to 3rd period math on time. [Student late for class and teacher yells]
So “A” is our correct answer.
Maybe one day we'll find a human with a superior femur. [Chucknorris running through the forest]
...Maybe we already have.