CRR writes:
We accept speciation within the kind. That we can get hybrids between species and even between genera supports this view.
The initial radiation from the Ark into different environments would have encouraged rapid speciation within the kinds. Each new species would have reduced genetic diversity compared to the original population so speciation would slow down. Also today most ecological niches are filled, reducing opportunity for speciation.
Do you mean that the two giraffes on the Ark had more genetic diversity than the modern population? Are you trying to make us laugh?
Actually, to get the modern divergence from a single ancestral population (of more than two) would take about 2 million years. At your YEC necessary mutation rate, from 4,500 years, every single giraffe that was born would have been genetically dead (too many detrimental mutations).
CRR writes:
However even today speciation can be quite rapid in the right circumstances. "The rapid appearance today, of new varieties of fish, lizards, and more defies evolutionary expectations but fits perfectly with the Bible."
Speedy species surprise - creation.com
Those rapid adaptations will be, genetically, virtually identical to the parent populations, and they don't "defy" evolutionary expectations.
The 4 giraffe species show up to 2 million years worth of neutral divergence on their genomes. Even closely related subspecies within the 4 species show a minimum of 100,000 years worth of divergence from each other.
As for speciation slowing down, the subspecies observed (possibly nine) seem to indicate that it's ongoing.
And what about the
Samotherium? Were they on the Ark?
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