Introduction to Evolution and Natural Selection

Introduction to evolution, variation in a population and natural selection

Category:

Education

Tags:

• evolution
• natural
• selection
• variation
• biology

[fancybelizabeth]

you had me at "and maybe he also had a hat"

[vicksoma]

@InflatiblePalmTree An important thing i think you're missing: To say humans evolved from apes doesn't mean we can pick a chimpanzee out of the forest and say they are our ancestors. They are not. BOTH chimpanzees and humans are descendents of yet another (extinct) ancient ape that was different than both species. All species change over time (some more than others), and when two populations become separated they can BOTH change enough to be very different down the line.

[Gilgamesh417]

@KingDcome11 You're generalizing. It depends on the ecological niche that the moth your talking about. If the predators depended on color spectrum light, then the moth would evolve defenses to camouflage them based on color. But if the predators saw in a different spectrum, then the moth would evolve defense to camouflage based on that. It all depends on what predators are around in that specific moth specie's environment.

[KingDcome11]

@Gilgamesh417 So a moths surviving has never been based on their color?

[Gilgamesh417]

@KingDcome11 Because that theory has been disproven. Birds don't observe based on color - rather, they see in a spectrum beyond human vision (UV as well I think). The moth wings are supposed to disrupt that UV vision and NOT color vision. It's an interesting paper.

[KingDcome11]

and now there would be no more moths at all. I hope you understood my question.

[KingDcome11]

I'm new to this topic. I have a question. In the example of the moths. You know how before the industrial revolution trees were NOT black? How could then black moths survive before trees became black? they could have easily been spotted by birds and therefore would have been easily destroyed leaving only moths with white dots around. After the black moths were destroyed then Industrial revolution came and there were no black moths anymore therefore moths with white dots were destroyed .

[CromlechDolmen]

@xoalaraxoxo Baldness, although affected by senescence, is a phenomenon they only some experience, thus, it is not directly related to old age and again is becoming more common as the human race develops. The simple explanation is that unused enzymes cease being manufactured and trigger chemicals to alter the structure of our genes; these alterations may travel through the generations and become more pronounced. By the way, I'm not 50 I'm 19 - how embarrassing for you!

[CromlechDolmen]

@xoalaraxoxo We are also losing our appendixes, a few tens of thousands of years ago they were a large extension of our caecum, now they have become vestigial organs sucking a few minutes of our life. Again our wisdom teeth may have been used for finely grinding fibrous foods such as leaves etc., our bodies recognise that they are no longer needed and many people never develop any during their lifetime.

[CromlechDolmen]

@xoalaraxoxo Am I supposed to be impressed by the fact that he holds a Harvard degree in business? How does that have any bearing on how much he knows about genetics? I bet I know more on the subject than he does anyway. People may make mistakes, but I assure you I am no ordinary person; I have made no mistakes on my original comment. I can't explain all on one YouTube post but rest assured, the human race is indeed losing their fifth toe, within a few million years it will be gone 

[xoalaraxoxo]

@xoalaraxoxo @CromlechDolmen , we AREN'T losing our hair; perhaps from old age but that's due to the dying of cells. If you're talking about hair on our body, it's simply adapting to our environment. variation. if you go to the middle east or to mexico or spain, you'll see people are very hairy there. you need to get off your 50 year old trolling ass and stop trying to "correct" people with what you THINK is right, and do something productive with your life.

[xoalaraxoxo]

@CromlechDolmen get a life. he graduated from harvard, and people make some mistakes. he was only trying to relate to younger audiences when he even drew the picture. genes don't possess a mind; they're the things that make UP our mind. we're not losing our baby toes...whoever is has a mutation. we don't lose our wisdom teeth, we get them taken out. we don't lose our appendix; they become inflamed, having the need to be taken out.