Let’s test both theories. Take 1000 rabbits. Blast 50 with radiation to cause random mutations. Only those descended from that specific rabbit will possess this mutation. Unless all the others die, leaving only its descendants, it will not fix in the population.
LOL, Why invent fantasy hypotheticals when there are thousands of pages of research with empirical evidence to back it up? Right. Because it would demonstrate that you are completely wrong, yet again.....
The genetic basis of adaptive melanism in pocket mice
Identifying the genes underlying adaptation is a major challenge in evolutionary biology. Here, we describe the molecular changes underlying adaptive coat color variation in a natural population of rock pocket mice, Chaetodipus intermedius. Rock pocket mice are generally light-colored and live on light-colored rocks. However, populations of dark (melanic) mice are found on dark lava, and this concealing coloration provides protection from avian and mammalian predators. We conducted association studies by using markers in candidate pigmentation genes and discovered four mutations in the melanocortin-1-receptor gene, Mc1r, that seem to be responsible for adaptive melanism in one population of lava-dwelling pocket mice. Interestingly, another melanic population of these mice on a different lava flow shows no association with Mc1r mutations, indicating that adaptive dark color has evolved independently in this species through changes at different genes.
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