11-13-2013, 07:55 AM
"Natural selection refers to variation within species, as nature intended."
Sorry, nature doesn't "intend" anything. Nature just happens. And how do you think new species come about if variation only occurs "within species?"
"variation 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You perhaps have an outdated concept of species, probably the old one based on morphology, the shapes of plant structures, rather than genetics.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.
Sorry, nature doesn't "intend" anything. Nature just happens. And how do you think new species come about if variation only occurs "within species?"
"variation 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You perhaps have an outdated concept of species, probably the old one based on morphology, the shapes of plant structures, rather than genetics.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.