17.3

Question 1

Reproductive Isolation

Answer 1

When a population becomes reproductively isolated, they can become different species. Reproductive Isolation can develop in ways such as behavioral iso, geographic iso, and temporal iso.

Question 2

Behavioral Isolation

Answer 2

When two organisms start to differ because of their behavior.

ex: birds might become behaviorally isolated due to their courtship rituals.

Question 3

Geographic Isolation

Answer 3

When two populations are separated by geographic barriers

ex: Squirrels around the grand canyon began to differ due to their location.

Question 4

Temporal Isolation

Answer 4

Happens when two or more species reproduce at different times.

ex: species of flower that last only one day must be pollinated on that day to produce seeds. Because the species bloom on different days, they cannot pollinate each other.

Question 5

Molecular Clock

Answer 5

Uses mutation rates in DNA to estimate the time that two species have been evolving independently.