00:01
What is so important about segmentation? a, it allows larger body size.
00:07
B, it allows complex body forms.
00:10
C, it increases mobility.
00:13
D, it reduces surface area to volume ratio.
00:16
Or e, it allows body parts to be eaten without killing the organism.
00:21
So, segmentation is where you can see it in the beginning in an embryo.
00:27
If i draw a blob, segmentation means that you get these band, patterns forming.
00:33
And in the embryo, these bands are concentration gradients of different messengers.
00:41
And these give rise to different segments in the final form.
00:45
For example, if you think of insects, they have a segment for the head, they have the thoracic segments, and they have the abdominal segments.
00:57
If you think of drosophila, our favorite fruit fly, you can see in the forex, there's an early segment with the halters and then a later segment with full winks.
01:10
So you get these segments through the body and the segments can differ a lot...