Question 1

Which of the following best describes the concept of 'struggle for existence' as it applies to Atlantic cod populations?

Accepted Answer

Most eggs produced by cod are consumed as plankton, and only a small fraction survive to adulthood.

Question 2

What is the primary evolutionary consequence of trophy hunting in bighorn sheep populations?

Accepted Answer

It removes the largest and strongest males, leading to a decrease in average horn length and body weight.

Question 3

Which equation describes the change in population size over time, considering births, deaths, immigration, and emigration?

Accepted Answer

$$N_{t+1} = N_t + B - D + I - E$$

Question 4

In the context of population genetics, what is an allele?

Accepted Answer

An alternative form of a gene that may occur at a given locus.

Question 5

Which mechanism of evolution is responsible for the spread of genes for sex switching at a smaller size in rock shrimp populations?

Accepted Answer

Natural selection

Question 6

What is the geometric growth equation for population size?

Accepted Answer

$$N_{t+1} = \lambda N_t$$

Question 7

Which type of natural selection favors individuals with intermediate phenotypes?

Accepted Answer

Stabilizing selection

Question 8

What is the main difference between Mendelians and Biometricians in early evolutionary theory?

Accepted Answer

Mendelians believed evolution occurred through macromutations, while Biometricians explained change by gradual transitions in populations.

Question 9

Which equation describes exponential population growth?

Accepted Answer

$$\frac{dN}{dt} = rN$$

Question 10

What is the evolutionary impact of poaching on African elephant populations?

Accepted Answer

It decreases the proportion of elephants with tusks, as tuskless individuals are less likely to be poached.

Question 11

Which of the following is an example of directional selection?

Accepted Answer

Medium ground finches evolving larger beak sizes during drought.

Question 12

What is a cline in evolutionary biology?

Accepted Answer

A gradual change in a characteristic over a geographic region.

Question 13

Which of the following best explains why bar-headed geese can migrate over the Himalayas?

Accepted Answer

They have evolved hemoglobin with a very high affinity for oxygen.

Question 14

Which process is NOT one of the four key mechanisms influencing evolution?

Accepted Answer

Photosynthesis

Question 15

Which type of variation is illustrated by earlobe attachment and sex cell production?

Accepted Answer

Discontinuous variation

Question 16

If a population of fruit flies exhibits a decrease in the frequency of the AdhS allele as latitude increases, what evolutionary phenomenon is this an example of?

Accepted Answer

Cline

Question 17

Which selection type would most likely result in a population with two distinct phenotypic groups, such as African seedcrackers with either large or small beaks?

Accepted Answer

Disruptive selection

Question 18

What is the main effect of commercial fishing targeting older, larger cod?

Accepted Answer

It reduces the age and size at which cod mature.

Question 19

Which formula would you use to calculate the per capita intrinsic rate of increase in a population experiencing exponential growth?

Accepted Answer

$$r = \frac{dN}{dt} \div N$$

Question 20

Which of the following is a real-world example of rapid adaptive evolution?

Accepted Answer

Changes in beak length in bugs feeding on different fruit sizes in Florida and Oklahoma.

Evolution by Natural Selection: Mechanisms, Evidence, and Population Dynamics

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