Scientists believe that the giraffe originally had a short...

Name: Problem 22, Chapter 6: SAT Biology E/M
Uploaded: 2020-05-05T21:24:02-08:00
Duration: 7 min 51 s
Channel: Ashley Thompson
Description: Scientists believe that the giraffe originally had a short neck that has grown longer over time. The most likely explanation of this is which of the following? I. Natural selection II. Adaptive radiation III. Divergent evolution (A) I only (B) I and II only (C) I and III only (D) II and III only (E) I, II, and III

Scientists believe that the giraffe originally had a short neck that has grown longer over time. The most likely explanation of this is which of the following? I. Natural selection II. Adaptive radiation III. Divergent evolution (A) I only (B) I and II only (C) I and III only (D) II and III only (E) I, II, and III

Scientists believe that the giraffe originally had a short neck that has grown longer over time. The most likely explanation of this is which of the following?
I. Natural selection
II. Adaptive radiation
III. Divergent evolution
(A) I only
(B) I and II only
(C) I and III only
(D) II and III only
(E) I, II, and III

Key Concepts

Divergent Evolution

Divergent evolution refers to the process where two or more species sharing a common ancestor become more different over time, often as they adapt to different environmental conditions or ecological niches. This can lead to the development of new species with distinct characteristics.

Natural Selection

Natural selection is an evolutionary mechanism where individuals with traits that are better suited to their environment tend to survive and reproduce at higher rates. Over time, this process leads to changes in the traits within a population as advantageous traits become more common.

Adaptive Radiation

Adaptive radiation is the process by which a single ancestral species rapidly diversifies into a multitude of new forms, particularly when changes in the environment make new resources available, create new challenges, or open new environmental niches.

Transcript

00:01 So why scientists believe that giraffe snake grow longer over time? let's look at these three terms and get our answer.

00:09 So first we have divergent evolution.

00:12 And that means two or more species comes from a common ancestor.

00:30 And in divergent evolution, the species evolve independently.

00:38 So an example of divergence would be if we look at the species evolve independently.

00:44 Dog, we look at a dog, a wolf, and a fox.

00:57 So even though they're not the same exact animal, you could tell that they come from the same kind of ancestry.

01:08 So they both have a similar nose.

01:12 They both have a similar facial structure with their eyes and where their ears are and their teeth are similar, everything is similar, but they're not the same animal.

01:29 That's an example of divergent evolution.

01:33 Next we have adaptive radiation.

01:40 And adaptive radiation is when organisms or species diversify fests from their ancestral species.

02:11 Now, an example of this, well first in adaptive radiation, this relates to environmental changes.

02:22 So divergence, they evolve independently, and then in adaptive radiation, they diverse fast from their ancestral species, but it usually relates to environment changes.

02:43 So an example of this would be if we look at different types of finches or bird beaks.

02:54 So if we look at a bird beak, a tropical bird beet, then you may notice that its beak is way longer and pointier.

03:16 And with the tropical bird beet, that's because when it's more pronounced that way, they're able to grab fruit better and they're able to get to bugs much faster.

03:29 So that's good for that environment.

03:44 Then we may have the insect.

03:49 You may have the, i guess, the bird beak that's here in the states.

03:58 So i'm not sure of a common bird, but we'll just call this bird, united states a bird...

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