Population Growth/History of Evolution

Question 1

When do the values of r and Ro lead to positive growth, negative growth, and no growth

Answer 1

Ro > 1 there is positive growth r > 0
Ro < 1 there is negative growth r < 0
Ro = 1 no growth r = 0

Question 2

How can we estimate initial population size?

Answer 2

Using the mark/recapture method with tags or the photographic mark recapture method.
Equation :
N = MC/R

Question 3

Density Independent Controls

Answer 3

Factors affecting population size regardless of how many individuals there are.
Hurricanes, Ice Storms, Floods, Fires

Question 4

Density Dependent Controls

Answer 4

Factors affecting population size due to the number of individuals
Predators, Pathogens, resources, wildfire(if population is the source of fire)

Question 5

Catastrophism

Answer 5

Earth and life on it are primarily shaped by major sudden events

Question 6

Gradualism

Answer 6

Earth and life on it are primarily shaped by long, slow processes

Question 7

How could the fossil record provide evidence for catastrophism?

Answer 7

Sudden events cause extinction and blank spots or gaps in the fossil record. Disappearance of some lineages and appearance of new ones.

Question 8

How could the fossil record provide evidence for gradualism?

Answer 8

You would observe gradual differences in traits over time in the fossil record without unnaturally large gaps.

Question 9

What are Homologous traits?

Answer 9

Descent with modification produces similar traits in different organisms because they’re inherited from a common ancestor

Question 10

What are analogous traits?

Answer 10

Similar traits in different organisms because of similar selective pressure, convergent evolution