When a mutation occurs, there are four possibilities for
the mutant...
I'd nitpick this slightly, since there's a slight anthropocentric bias here.
You could say there's three types of mutations: genes that do not affect evolutionary fitness, genes that increase fitness (faster running, better eyesight, etc) and genes that decrease fitness. (chromosomal trisomy, which either instantly kills the host, or greatly reduce its fitness)
And, of course, fitness is relative. Heterozygous HbgS makes you resistant to malaria, homozygous HbgS gives you sickle cell anemia. Being tall adds fitness in a calorie-rich environment, but reduces it when food is comparatively expensive. Etc etc etc.
But you probably won't want to double the length of the article, by going into even greater depth on genetics.
I'd nitpick this slightly, since there's a slight anthropocentric bias here.
You could say there's three types of mutations: genes that do not affect evolutionary fitness, genes that increase fitness (faster running, better eyesight, etc) and genes that decrease fitness. (chromosomal trisomy, which either instantly kills the host, or greatly reduce its fitness)
And, of course, fitness is relative. Heterozygous HbgS makes you resistant to malaria, homozygous HbgS gives you sickle cell anemia. Being tall adds fitness in a calorie-rich environment, but reduces it when food is comparatively expensive. Etc etc etc.
But you probably won't want to double the length of the article, by going into even greater depth on genetics.