1-3-1-4-1 Defining

0 - 1 Background 1-3 Biological 1-3-1 Evolution 101 1-3-2-4 Microevolution

 Mechanisms 1-3-1-4-3

1-3-1-4-2 Detecting microevolutionary change

Detecting microevolutionary change

We've defined microevolution as a change in gene frequency in a population and a population as a group of organisms that share a common gene pool - like all the individuals of one beetle species living on a particular mountaintop.

Imagine that you go to the mountaintop this year, sample these beetles, and determine that 80% of the genes in the population are for green coloration and 20% of them are for brown coloration. You go back the next year, repeat the procedure, and find a new ratio: 60% green genes to 40% brown genes.


Microevolution - change in gene frequency

Download this graphic from the Image library.

You have detected a microevolutionary pattern: a change in gene frequency. A change in gene frequency over time means that the population has evolved.

The big question is, how did it happen?


Source http://evolution.berkeley.edu/evolibrary/article/0_0_0/evo_38