Does anyone know about the normal distribution and how it is connected to evolution??

Question

i know about normal distribution, i need to know how it is connected to EVOLUTION....PLEASE HELP!!

Answer 1

Heritable characteristics are often expressed in a normal distribution - eg some folks are very tall, some very short, most are in the middle. This is due to natural variation and phenotypic expression in the genes that control these characteristics. Selection pressures in isolated populations may favor one extreme over the rest in certain of these normally distributed characteristics. As natural selection proceeds in this isolated population, the extreme characters that are selected eventually dominate, and the normal distribution of the character in the isolated population shifts toward that end. The character is still distributed normally but the median has moved and the population is said to have evolved, that is, the gene frequency has changed.