(Barbarian suggests naming two major groups said to be evolutionarily connected)
Amborella trichopoda, for one. Mostly like an angiosperm, but lacks some features of angiosperms, such as specialized vascular tissues. In the stem, it's anatomically more like gymnosperms. The primitive flowers have several features that are consistent with modified gymnosperm structures. Particularly, the bracts are similar in structure to those forming scales in gymnosperms.
Sorry B. This won't do.
http://www.seedbiology.de/evolution.asp
"The
gymnosperms have 'naked seeds', i.e. their ovules and seeds (fertilized ovules) are exposed
on the surface of sporophylls and analogous structures.
In contrast to the gymnosperms [...] ("Nacktsamer"), the
angiosperms are "Bedecktsamer", i.e. their ovules and seeds are enclosed inside the ovary, which is the base of a modified leaf and is called carpel.
Another very important difference to gymnosperms is the angiosperm
double fertilization. This leads to an additional
novel tissue with maternal protuberance, the
triploid endosperm. In mature seeds of most angiosperm species, the embryo is enclosed by endosperm tissue. In addition, angiosperm seeds can be dispersed as fruits, i.e. the seeds can have in addition
pericarp (fruit coat) around the testa (seed coat). [...]
The rapid rise and early diversification of the angiosperms occurred during the Cretaceous time and was called 'an abominable mystery' by Charles Darwin."
I find it positively imbecilic that any botanist can look at
Amborella and call it a 'primitive, ancestral' plant.
http://en.wikipedia.org/wiki/Amborella
I wonder if he knew what he was saying here:
That is, it represents a line of flowering plants that diverged very early on (about 130 million years ago) from all the other extant species of flowering plants.
So there were already other angiosperms at the time
Amborella 'diverged' from them. It therefore is not and cannot be ancestral to them. Now you have the problem of identifying
Amborella's ancestors too, especially given the following description:
Typically, 1 to 3 carpels develop into fruit per flower. The fruit is an ovoid red drupe [..] The inner pericarp is lignified and surrounds the single seed. The embryo is small and surrounded by copious endosperm."
The seed is 'enclosed' within the pericarp.
This, the most fundamental difference between the angiosperms and the gymnosperms is in full existence in the allegedly 'primitive'
Amborella. The carpel is already enclosed.
* in gymnosperms
seed is on the surface of the sporophyll
Gymnosperms include plants whose seeds are not enclosed in an ovule, hence why they’re called “naked seeds” (Think of a pine cone).
* Angiosperms include plants whose mature
seeds are enclosed in an ovule (think of an apple).
Q. How did one change into the other? No intermediates are possible. The seed is either in, or out. Darwin gave up on this one, so why don't you?
You have some accounting to do, not, please note, hypothesising.
e
The evidence indicates that eukaryotes are not evolved from prokaryotes, but are rather a result of endosymbiosis with a number of organisms. Would you like to see the evidence for that?
Yes please. GENUINE evidence I mean, not another batch of guesswork and hypothesising. I mean evidence that accounts clearly for such statements as these:
There is such a large difference between prokaryotes and eukaryotes that the creation of eukaryotes is virtually a total re-design, a second creation on a par with with the original creation of prokaryote life.
For one thing, the simplest eukaryotes have over 10 times the DNA found in the most complex prokaryote[FOOTNOTE: Scott F. Gilbert, Developmental Biology, 5th Ed. p.5] and are much larger. Figure 3 illustrates one prominent feature of eukaryotes: the extensive use of membranes to form controlled micro-environents where various specialized activities occur.
http://www.ps-19.org/Crea07Eukary/index.html
Yes indeed. I'd really like to see something that does not exist. That will definitely be a first.
Two major groups said to be evolutionarily connected. Evolutionary theory is not about the origin of life. If you want to imagine God magically made the first living things, that doesn't affect evolutionary theory.
A nice cop-out, don't you think?
Suppose tomorrow, they managed to create some life in a lab somewhere. Don't you think there'd be enormous evolutionary chortling and trumpeting everywhere? I promise you, there would.
But haven't you heard of 'pre-biotic evolution' and such like? What do you make of them?