Chromosome counts and evolution
Another non-ID challenge to evolution theory are the questions concerning the mechanisms and genetic effects of the evolution of different chromosome counts in different species and varieties of species. The Talkorigins website tries to give some answers to these questions, but these answers are not adequate. Talkorigins says that chromosome counts can change by the breakup or joining of individual chromosomes or by the phenomenon called "polyploidy" where multiple copies of all the chromosomes are created, but this does not seem to be a good explanation for the great variation in chromosome counts (Talkorigins gives examples as low as 5 and as high as 512). Also, these means of changing the chromosome count could not contribute much to evolution because no new genetic material is created -- in particular, organisms created by polyploidy are similar to their parents. Also, polyploidal organisms are often sterile, and in any case polyploidy would initially be a barrier to sexual reproduction. Furthermore, polyploidy would create great problems in future evolution because there is not just one set of genes but multiple sets of genes that must evolve through genetic variation, and the issue of dominant and recessive genes would arise in such future evolution.
Labels: Non-ID criticisms of evolution