Weatherman2020
Diamond Member
- Mar 3, 2013
- 94,529
- 66,432
The code for brown eyes already exists. Just because it becomes dominate does not mean it was a mutation created by chance.One misspelling or out of place in any segment of a strand likely means disease. Not an improved condition.
A misspelling in a gene can lead to blue eyes in a child with brown-eyed parents (and accusations of marital infidelity). It can lead to a cleft chin or longer limbs. It's difficult to see in our pampered world how any of these permutations might lead to preferential survival ... But, for creatures, they exist in a very narrow window between procreation and extinction, any change could lead to one or the other.