tag:blogger.com,1999:blog-37148773.post2636274770217083367..comments2024-03-27T14:50:47.345-04:00Comments on <center>Sandwalk</center>: Variation and Natural SelectionLarry Moranhttp://www.blogger.com/profile/05756598746605455848noreply@blogger.comBlogger5125tag:blogger.com,1999:blog-37148773.post-71047270504288743502011-05-23T12:28:42.596-04:002011-05-23T12:28:42.596-04:00Rui Monteiro says,
Speciation needs sexual select...Rui Monteiro says,<br /><br /><i>Speciation needs sexual selection to be fully understand.</i><br /><br />Really? How does that work in mushrooms? What about speciation in diatoms or bacteria? Is there a lot of sexual selection going on there?<br /><br>Larry Moranhttps://www.blogger.com/profile/05756598746605455848noreply@blogger.comtag:blogger.com,1999:blog-37148773.post-41666566020729157882011-05-22T12:40:18.501-04:002011-05-22T12:40:18.501-04:00Speciation needs sexual selection to be fully unde...Speciation needs sexual selection to be fully understand. Overcome the Status Quo and its Natural Selection exclusivity! See how here: http://nature-sucks.blogspot.com/SpeciesProtocolhttps://www.blogger.com/profile/14577219839309264388noreply@blogger.comtag:blogger.com,1999:blog-37148773.post-36999008677554543122009-02-17T07:34:00.000-05:002009-02-17T07:34:00.000-05:00I agree wit larry. Species hybridization as a mech...I agree wit larry. Species hybridization as a mechanism for the origin of new species is NOT natural selection.<BR/>AND, species hybridization has beeen seriously underestimated as a cause of speciation, despite been pretty wel documented in both plants AND animals. Specially alopolyploidyA. Vargashttps://www.blogger.com/profile/04876504431768677209noreply@blogger.comtag:blogger.com,1999:blog-37148773.post-868140096562981852009-02-16T11:04:00.000-05:002009-02-16T11:04:00.000-05:00and in this case there is experimental evidence th...and in this case there is experimental evidence that natural selection does act on flower color variation in radishes (Irwin et al. Ecology, 84(7), 2003, pp. 1733–1743)Anonymousnoreply@blogger.comtag:blogger.com,1999:blog-37148773.post-61343862786663526322009-02-16T10:58:00.000-05:002009-02-16T10:58:00.000-05:00LarryWhile I understand and appreciate your point,...Larry<BR/><BR/>While I understand and appreciate your point, the opposite can and does happen. That is, drift is assumed when natural selection is in fact operating. A famous example is Sewall Wright's studies on variation in Linanthus flower color. He thought drift was responsible for the differences in the frequency of blue and white flowers in different populations. Decades later Schemske and Bierzychudek (Evolution 55(7):1269-1282. 2001) showed instead that natural selection favors traits linked to flower color in different environments. So, you are right that we should not just assume our favorite evolutionary force is acting but it is not selection that is always assumed.Anonymousnoreply@blogger.com