Evolution at work

Evolution at work

Berichtdoor Planoudes » 05 jan 2010, 12:35

White Lizards Evolve in New Mexico Dunes
By HENRY FOUNTAIN
Published: January 4, 2010
The White Sands of New Mexico are a good place to study evolution in progress. One reason is that the terrain, gypsum dunes white as a sheet of paper, is so different from the surrounding area. Another is that the dunes formed only about 6,000 years ago.

“From an evolutionary perspective, that’s really the blink of an eye,” said Erica Bree Rosenblum, a professor at the University of Idaho who has been studying evolution at White Sands for much of the past decade. Her focus has been on three lizard species that elsewhere are dark skinned but in White Sands have each evolved a white-skinned variety that makes them hard to find. “It’s really obvious what’s happened,” Dr. Rosenblum said. “Everybody got white so that they could better escape from their predators.” It’s a great example of convergent evolution, of species independently acquiring the same traits.

One question about convergent evolution is the mechanism by which it happens. Sure, these three lizards all developed white skin, but did they do it in the same way? Dr. Rosenblum and her colleagues have provided answers to this question in a paper in The Proceedings of the National Academy of Sciences.

“At first blush it seems like the answer is yes,” she said. In at least two of the lizard species, the researchers found that mutations on the same gene, linked to the production of the skin pigment melanin, were responsible.

The second part of the story is more interesting, Dr. Rosenblum said. In the two species, the mutations are different, and the molecular mechanism by which less melanin is produced is different, too.

And, she said, the different mechanisms have had an effect on how the white-skinned trait has spread through the populations. In one, the mutation has made the white-skinned trait dominant; in the other, the mutation has made it recessive. So, according to basic Mendelian genetics, the trait spreads more quickly in the first lizard species than the second.

Lizards.jpg


http://www.nytimes.com/2010/01/05/scien ... ef=science
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Re: Evolution at work

Berichtdoor Eliyahu » 15 nov 2018, 08:21

Planoudes schreef:White Lizards Evolve in New Mexico Dunes
By HENRY FOUNTAIN
Published: January 4, 2010
The White Sands of New Mexico are a good place to study evolution in progress. One reason is that the terrain, gypsum dunes white as a sheet of paper, is so different from the surrounding area. Another is that the dunes formed only about 6,000 years ago.

“From an evolutionary perspective, that’s really the blink of an eye,” said Erica Bree Rosenblum, a professor at the University of Idaho who has been studying evolution at White Sands for much of the past decade. Her focus has been on three lizard species that elsewhere are dark skinned but in White Sands have each evolved a white-skinned variety that makes them hard to find. “It’s really obvious what’s happened,” Dr. Rosenblum said. “Everybody got white so that they could better escape from their predators.” It’s a great example of convergent evolution, of species independently acquiring the same traits.

One question about convergent evolution is the mechanism by which it happens. Sure, these three lizards all developed white skin, but did they do it in the same way? Dr. Rosenblum and her colleagues have provided answers to this question in a paper in The Proceedings of the National Academy of Sciences.

“At first blush it seems like the answer is yes,” she said. In at least two of the lizard species, the researchers found that mutations on the same gene, linked to the production of the skin pigment melanin, were responsible.

The second part of the story is more interesting, Dr. Rosenblum said. In the two species, the mutations are different, and the molecular mechanism by which less melanin is produced is different, too.

And, she said, the different mechanisms have had an effect on how the white-skinned trait has spread through the populations. In one, the mutation has made the white-skinned trait dominant; in the other, the mutation has made it recessive. So, according to basic Mendelian genetics, the trait spreads more quickly in the first lizard species than the second.

Lizards.jpg


http://www.nytimes.com/2010/01/05/scien ... ef=science


Bs"d

Hmmm..... Hagedissen die in hagedissen veranderd zijn.

Lijkt me nou niet direkt een duidelijk voorbeeld van evolutie.

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Re: Evolution at work

Berichtdoor Digit » 15 nov 2018, 08:29

Eliyahu schreef:Hmmm..... Hagedissen die in hagedissen veranderd zijn.
Lijkt me nou niet direkt een duidelijk voorbeeld van evolutie.

Als de verschillen groot genoeg zijn, is het dat wel. En gezien de tijdschaal zijn ze dat in dit geval dus wél.
Of dacht je dat evolutie betekent dat hagedissen in enkele generaties in konijnen kunnen veranderen?

Typisch voorbeeld van kwaadwillig creationistisch kromdenken!

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Re: Evolution at work

Berichtdoor willem_betz » 15 nov 2018, 14:28

Digit schreef:Of dacht je dat evolutie betekent dat hagedissen in enkele generaties in konijnen kunnen veranderen? Digit

Neeen Digit, je verraadt hiermee dat je in evolutie gelooft.
Elke nieuwe soort wordt door de grote tovenaar in de hemelen gemaakt vanaf nul. Hokus pokus poef!
Soms was hij wat slordig of vergeetachtig, zoals eerst een man scheppen zonder na te denken hoe die zich kan voorplanten, dus snel correctie door een vrouwelijke versie bij te maken. Poef! Einde goed....
Creationisme is een goede zaak en schenkt het mensdom veel vermaak.
We kunnen Eli vragen naar zijn visie op het "geschapen naar zijn evenbeeld". Was het een exacte kopie ? Geldt dat ook voor wat gewoonlijk in de broek verborgen is ? Zo ja, als er geen vrouwen zijn, waarvoor had de grote tovenaar dat attribuut nodig, wat deed hij ermee ? Idem voor Adam ? :wink:
Geloof je alle nonsens, of sommige niet? Hoe maak je het onderscheid?
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Re: Evolution at work

Berichtdoor Kristof » 15 nov 2018, 17:33

Een van de vele bewijzen voor evolutie: mammoet en olifant.
https://nl.wikipedia.org/wiki/Mammoeten
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