Natural Selection review for exam

Natural Selection review for exam - acclimation Adaptation...

Info iconThis preview shows pages 1–3. Sign up to view the full content.

View Full Document Right Arrow Icon
1 acclimation Adaptation Stabilizing Selection—Another example Disruptive Selection—another example
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
2 • Can natural selection operate if there is no variation within populations? •a ) y e s b) no Why are many natural selection experiments carried out on bacteria? • a. because bacteria mutate faster than other organisms • b. because bacteria have larger population sizes than other organisms • c. because natural selection operates best on small organisms • d. because many generations can be followed in a short time • e. because bacterial strains vary more than other kinds of organisms Example 1: • Most, but not all elephants have tusks. Tusks are used in self-defense, but elephants can defend themselves in other ways. In most populations, tuskless animals are rare. Tusks are highly prized by ivory collectors—poachers have to kill elephants to collect the tusks. • In some elephant populations where poachers have been operating for multiple generations, tusklessness is becoming more frequent.
Background image of page 2
Image of page 3
This is the end of the preview. Sign up to access the rest of the document.

This note was uploaded on 07/29/2010 for the course BIS 2B taught by Professor Strong during the Summer '08 term at UC Davis.

Page1 / 6

Natural Selection review for exam - acclimation Adaptation...

This preview shows document pages 1 - 3. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online