Subduction Zone
Regular Member
So, there was, what? A giant leap forward or sideways in genetics and the common ancestor's descendants were suddenly two entirely different kinds?
"Kinds" is a meaningless nonsense term. It cannot be defined. Speciation occurred. And we directly observe speciation quite often. That occurs when first a population is divided by some means. Second as time passes the number of changes in the genome of each population increases to the point that they can no longer successfully interbreed. Like lions and tigers. Yes, they can have offspring but those lines do die out. Given more time their offspring will be like that of horses and mules.
And speaking of horses and mules do you remember when you claimed that a change in chromosome numbers means that there could be no more fertile interbreeding? I asked for evidence of that claim and you could not find any. You should have owned up to your failure.
To be honest it was a trap because I knew that you were wrong. It only takes one example of two populations that can still interbreed (therefore still one species by definition) that have different number of chromosomes. You really should have taken me up on my hint to check out the chromosome count of zebras and horses. You should still look that up. Of course those offspring are sterile. But the interbreeding of Przewalski's horse and the domestic horse is possible and those offspring are very fertile. Przewalski's horse has one more pair of chromosomes and it does not appear to be a problem at all:
Przewalski's horse - Wikipedia
'The karyotype of Przewalski's horse differs from that of the domestic horse by an extra chromosome pair because of the fission of domestic horse chromosome 5 to produce the Przewalski's horse chromosomes 23 and 24. In comparison, the chromosomal differences between domestic horses and zebras include numerous translocations, fusions, inversions and centromere repositioning.[19] This gives Przewalski's horse the highest diploid chromosome number among all equine species. They can interbreed with the domestic horse and produce fertile offspring (65 chromosomes).[10]'
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