Sentences with phrase «speciation in»
In a punctuationist model of speciation in Homo, the anatomical and cognitive adaptations unique H. sapiens would have evolved together in a small, isolated population of its parent species (currently thought to be H. heidelbergensis).
http://www.realclimate.org/
The Dobzhansky - Muller model has been used to study speciation in a variety of contexts [1]--[4].
However, it is difficult to ultimately evaluate what this means for the future of speciation in large mammals.
Dimensionality of sexual isolation during reinforcement and ecological speciation in Timema cristinae stick insects.
The Evolution of Herbivore - Regulated Secondary Metabolism During Polyploid Speciation in Native Nicotiana
Kronforst will lead the effort to analyze the molecular and genetic mechanisms of speciation in butterfly communities from temperate and tropical environments.
Phenotypic plasticity: its role in trophic radiation and explosive speciation in cichlids (Teleostei: Cichlidae)
After graduation, I worked as a technician studying speciation in wild tomatoes and rapid adaptation in Trinidadian guppies before starting graduate school at the University of Toronto.
The scientists point out that, in the wild (where there are no magnetic wingmen), the females» preference for local males» vibrations could be an early sign of speciation in the red mason bees: If the females of one subspecies stop mating with the other subspecies entirely, the two lineages may eventually become incompatible and diverge into two separate species.
«We show that sexual selection causes speciation in an unexpected way,» she said.
This is by far the fastest event of speciation in any marine vertebrate to date.
A research group at the University of Helsinki discovered the fastest event of speciation in any marine vertebrate when studying flounders in an international research collaboration project.
«The comparison of lanternfishes and bristlemouths is ideal for studying speciation in the deep sea.
Hybrid speciation in experimental populations of yeast.
For example, a study just published in PLOS Genetics by researchers from Eawag and the University of Bern — investigating rapid speciation in threespine stickleback in and around Lake Constance — shows that a species can begin to diverge very rapidly, even when the two daughter species breed alongside one another simultaneously.
And also for you dog people, we won't get into it in much detail, but my column in this issue, the Antigravity column, I suggest a modest proposal, if you will; that in order to answer some of the charges of creationists that there is no proof of evolution — we never saw any speciation in action actually happen, well, why don't we just say, the differences dog breeds [are] different species?
@Vic — Science has repeated evolution, e.g. SELEX / RNA aptamers, speciation in labs, Lenski's E. coli experiments, artificial selection in domesticated organisms, etc, etc..
Add to this extant biogeography, Neanderthal DNA sequences clearly showing their distinction from H. sapiens, demonstrable speciation in the lab and in the field, etc, etc..
Other indications of evolution are too numerous to actually list in full, but a few might be the clear genetic distinction between Neanderthals and modern man; the overlapping features of hominid and pre-hominid fossil forms; the progressive order of the fossil record (that is, first fish, then amphibians, then reptiles, then mammals, then birds; contradicting the Genesis order and all flood models); the phylogenetic relationships between extant and extinct species (including distributions of parasitic genetic elements like Endogenous Retroviruses); the real time observations of speciation in the lab and in the wild; the real time observations of novel functionality in the lab and wild (both genetic, Lenski's E. coli, and organsimal, the Pod Mrcaru lizards); the observation of convergent evolution defeating arguments of common component creationism (new world v. old world vultures for instance); and... well... I guess you get the picture.
We have directly observes speciation in Blackcap birds, fruit flies, mosquitos, mice, Shortfin molly fish and other specimens.
We have directly observed speciation in the field and in the lab.
We have directly observed speciation in Blackcap birds, fruit flies, mosquitos, mice, Shortfin molly fish.
Look also at the speciation in the Galapagos.
Time and time again, they have confirmed the prediction that we should find cases of speciation in the fossil record.
No one yet knew about winter sea - ice reaching the British Isles 2.51 million years ago, nor about all those antelope speciations in Africa about the same time.
Not exact matches
Actually, it was proposed to explain the relative rarity of transitional forms, not their total absence, and to explain why speciation appears to happen relatively quickly in some cases, gradually in others, and not at all during some periods for some species.
Speciation has been duplicated in a lab as well and there is no disputing this.
6) Selection is a filter for functionality, demonstrated both in the lab (RNA aptamers, Lenski's E.coli) and in the wild (speciation events, the Pod Mrcaru lizards, predator - prey relationships, etc, etc..)
See, for example, (Weinberg, J.R., V.R. Starczak, and D. Jorg, 1992, «Evidence for rapid speciation following a founder event in the laboratory.»
The species of wheat that we in the West use for bread only developed in the last few thousand years as a result of two instances of sympatric speciation (different to selective breeding, but an agent of evolution none the less).
We further understand that speciation will frequently not provide any clear morphological transition that would be evidenced in a fossil, i.e. in many instances, distinct species are only identifiable via phylogenetic analysis for the absence of gene flow.
Bacterial speciation occurs all the time, including in laboratories where it is metiulously docu / mented.
Therefore, Dawkins clearly was discussion speciation events in his book.
@My Dog is a jealous Dog: My point is that in a speciation event, one species becomes two.
@My Dog is a jealous Dog, «This is an error in his mathematics, not the definition of species, speciation events, or mutations.»
If I state that the average lifespan of a species is 2 million years, and the average speciation rate is once every 1.5 million years, then each species can only evolve once in its lifespan, a chain of 1000 transitions will only have 1000 species and at most only two species will be alive at any time.
His point is that speciation events can only occur on generational boundaries, not in the same individual.
@Live4Him, «His point is that speciation events can only occur on generational boundaries, not in the same individual.»
Live4him, you assume that every time a speciation event occurs, both new species, will become 2 new species 100 % of the time, in your case for 1003 times in row.
Evolutionary changes that result in speciation (IE: males and females can't reproduce together anymore) take tens of thousands of generations.
In general, to understand evolutionary biology, one must understand the concepts of genetic inheritance, population genetics, and have a grasp on the concept of speciation.
However we've seen in nature speciation without the need of artifical selection.
But speciation has been observed in the laboratory.
Evolutionists have themselves noted these glaring flaws in Darwinian theory and have sought to deal with them in the manner of Stephen J. Gould, who has suggested that speciation is a sudden and dramatic event which therefore does not show up in the fossil record.
You can pull from palaeontology, you can look at experiments, you can find actual examples of speciation events that have happened in our lifetimes, and yes, genetics too.
Further microevolution within these distinct subpopulations produces the more observable morphological features readily distinguishable as two distinct species, however, the actual speciation event took place in the initial microevolutionary change.
Additionally, note that such microevolutionary changes can and do result in reproductive isolation between these subspecies / subpopulations (i.e. speciation).
Colin... Allopatric speciation is another argument in the quiver of intelligent design.
No, it's called speciation which is not evolution in the Darwin's way.
(The existence of «ring species», such as the Larus gulls, illustrates the problem, as indeed does «speciation» in evolution, whereby all animals are of the same species as their parents and offspring, but not as their remote ancestors or descendents.)