Search found 50 matches

by jevg
Sun Sep 05, 2010 8:54 pm
Forum: Evolution
Topic: Experimental evidence for evolution
Replies: 103
Views: 244968

Re: Experimental evidence for evolution

by Geokinkladze » Fri Sep 03, 2010 11:44 pm Could those of you who say "Darwin was a Gradualist not a Punctualist" explain what he meant when he said this: "the periods during which species have undergone modification, though long as measured in years, have probably been short in com...
by jevg
Fri Sep 03, 2010 10:44 pm
Forum: Evolution
Topic: Experimental evidence for evolution
Replies: 103
Views: 244968

Re: Experimental evidence for evolution

My sincere apologies, thank you for being so light hearted about it. I promise I will try not to press too hard. … there are quite a few patterns by better than me that have demonstrated that simple conditions and randomness can lead to apparent order. I could refer you to all the chaos theory, or m...
by jevg
Thu Sep 02, 2010 12:33 pm
Forum: Evolution
Topic: Experimental evidence for evolution
Replies: 103
Views: 244968

Re: Experimental evidence for evolution

canolan True randomness as a mathematical abstraction and life do not completely intersects… May I correct you, randomness is not a mathematical abstraction. If a sequence is unpredictable, we call it "random". Stated another way, outcomes which lack discernible patterns are said to be &q...
by jevg
Wed Sep 01, 2010 8:53 pm
Forum: Evolution
Topic: Experimental evidence for evolution
Replies: 103
Views: 244968

Re: Experimental evidence for evolution

I find it difficult to follow your line of reasoning. If something is random it is by nature unpredictable. There cannot be a “tendency / predilection toward anything if it is random. If there was this tendency then it is not random. What is the difference between the expression you use and say, “ra...
by jevg
Tue Aug 31, 2010 11:15 pm
Forum: Molecular Biology
Topic: Life
Replies: 17
Views: 15454

Re: Life

I am not too familiar with mtDNA but as I understand matters it does play a role in development as well.
by jevg
Tue Aug 31, 2010 11:01 am
Forum: Molecular Biology
Topic: Life
Replies: 17
Views: 15454

Re: Life

Mitochondria have their own genome and reside outside the nucleus.

In plants Chloroplasts too have their own genome
by jevg
Mon Aug 30, 2010 6:47 pm
Forum: Molecular Biology
Topic: Life
Replies: 17
Views: 15454

Re: Life

Hi josalsam How life began is not a question science has been able to answer. There are different ideas on how it may have originated, in scientific terms these are referred to as hypotheses. However all that can be scientifically stated is that life exists and new life always comes from a pre-exist...
by jevg
Mon Aug 30, 2010 4:23 pm
Forum: Evolution
Topic: Experimental evidence for evolution
Replies: 103
Views: 244968

Re: Experimental evidence for evolution

May I return to the Lenski experiment just to nail down this data on Non randomness. m Please refer to the “Discussion and Future directions” of this paper (page6) and note the replays of the experiments from archived generations that are referred to. Adaptations by mutations under stress are a well...
by jevg
Wed Aug 25, 2010 9:47 pm
Forum: Evolution
Topic: Evolution of sexual reproduction
Replies: 29
Views: 46301

Re: Evolution of sexual reproduction

As more fossil beds are found, the Cambrian Explosion is looking more artifactual (1) If I understand you correctly you are stating that the Cambrian radiation (explosion) is of human origin. Is that correct? Because that is what artifactual means. m (2) “As more fossil beds are found… Well there i...
by jevg
Tue Aug 24, 2010 7:21 pm
Forum: Evolution
Topic: Evolution of sexual reproduction
Replies: 29
Views: 46301

Re: Evolution of sexual reproduction

I assume you are familiar with the term Cambrian (radiation) Explosion that describes the geologically sudden appearance of multi-cellular animals in the fossil record during the Cambrian period of geologic time. During this event, over forty separate phyla first made their appearance on earth. Phyl...
by jevg
Mon Aug 23, 2010 10:03 pm
Forum: Evolution
Topic: Evolution of sexual reproduction
Replies: 29
Views: 46301

Re: Evolution of sexual reproduction

by Darby » Thu Aug 19, 2010 2:57 pm The mutation doesn't have to happen in a sex cell, just in the lineage of the sex cell, which means a lot of embryonic alterations will get passed on as well... Sorry for the delay in responding but I have been busy elsewhere. Of course mutation doesn’t have to h...
by jevg
Tue Aug 17, 2010 4:25 pm
Forum: Evolution
Topic: Evolution of sexual reproduction
Replies: 29
Views: 46301

Re: Evolution of sexual reproduction

As dmehling points out Consider primates for example. They would have arisen from a single common ancestor. For a new species to develop (I'm assuming a species cannot interbreed with its parent species) would you not have to have simultaneous changes occurring in the reproductive systems of each se...