11-13-2013, 09:58 AM
Pete says "And how do you think new species come about if variation only occurs "within species?"
You perhaps have an outdated concept of species, probably the old one based on morphology, the shapes of plant structures, rather than genetics. In any event, crossing between plant species is common in any kind of plant breeding."
New species are created by variation within species, and subsequent natural selection, until the variation is so great that DNA can no longer be exchanged with the original variety. This is the origin of species, perhaps you've heard of it? See 'Darwin.'
My "concept of species" is the one used by science, thanks.
Crossing between plant species is not how plant breeding is done. Plant breeding is within a species in traditional breeding. The ability to exchange DNA through sexual reproduction is what defines a species.
Russell
You perhaps have an outdated concept of species, probably the old one based on morphology, the shapes of plant structures, rather than genetics. In any event, crossing between plant species is common in any kind of plant breeding."
New species are created by variation within species, and subsequent natural selection, until the variation is so great that DNA can no longer be exchanged with the original variety. This is the origin of species, perhaps you've heard of it? See 'Darwin.'
My "concept of species" is the one used by science, thanks.
Crossing between plant species is not how plant breeding is done. Plant breeding is within a species in traditional breeding. The ability to exchange DNA through sexual reproduction is what defines a species.
Russell
Russell