So…So…

Which is the BEST bird?Which is the BEST bird?

Discuss with your group and be prepared to share your reasons!

Natural SelectionNatural Selection

A process where favorable traits that are A process where favorable traits that are heritableheritable (can be passed down to the next (can be passed down to the next generation) become more common in the generation) become more common in the following generations of a population and poor following generations of a population and poor traits become less common.traits become less common.

Natural selection acts on the Natural selection acts on the phenotype phenotype ((the the observable characteristics of an organism), so observable characteristics of an organism), so that individuals with favorable phenotypes are that individuals with favorable phenotypes are more likely to survive and reproduce than more likely to survive and reproduce than those with less favorable phenotypesthose with less favorable phenotypes

Is Natural Selection still happening today?Is Natural Selection still happening today?

Again, in your groups, try to think of a case where natural selection is active in the world today? Is this having a negative or positive affect?

Examples:Examples:

Drug Resistance: HIVDrug Resistance: HIV Obesity?Obesity?