Natural Selection Overview

Biological fitness is ________

• the ability to collect more food than all other organisms in a given environment

• the ability to survive and pass on one's genes in a given environment

• the ability to bench press 300 pounds without even breaking a sweat

Which of the following can affect an organism's biological fitness?

• A change to the organism's environment

• A change to the organism's sleeping routine

• A one-year membership to Planet Fitness

True or False? Individual organisms evolve.

• True; an organism can swap out its genes for more favorable ones to increase its chances of survival

• False; the frequency of a gene can change in a population over time. Populations evolve, not individuals

A primary source of genetic variation is​ (a)   . Genetic variation is​ (b)   . Organisms ​ (c)   choose which variations they would like to have.

• mutations
• mitosis
• random
• cannot
• can
• goal-directed

Match the descriptions with the correct type of natural selection.

Groups:

(a) Directional

,

(b) Stabilizing

,

(c) Diversifying/Disruptive

• One extreme trait is favored

• Population of black peppered moths increasing and white moths decreasing during Ind. Revolution

• 
• 
• Intermediate/average trait is favored

• 
• Both extreme traits are favored