AnswersFL-2000310-Biology 1 Sem 2 - FlexEvolutionary Relationships

Methods of Classification Answers

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Consider the two male oryx that are shown below.Which of Charles Darwin’s main points is depicted in the image?

Question illustration
A
Organisms within a population compete with each other to survive.
B
Over time, beneficial variations will be passed on to future generations.
C
More offspring are produced than can be supported by an environment.
D
All organisms within a population have an equal chance for survival.
22
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Thylacosmilus is a marsupial, and Smilodon is a mammal. Thylacosmilus and Smilodon both have saber teeth, but they do not share an ancestor that had saber teeth. What are saber teeth for these organisms?

A
analogous structures
B
homologous structures
C
vestigial structures
D
mutated structures
23

A bird that preys on moths is introduced to the habitat with moths and trees like the ones shown below. What will most likely happen to the population of moths in this habitat?

Question illustration
A
The population of moths will eventually become extinct.
B
The moths will evolve from dark to light due to a selective pressure.
C
The dark colored moths will experience disruptive selection.
D
The alleles that determine light and dark color in moths will equalize.
24

A biology teacher asks students to give examples of genetic variations that support the idea that changes in a population’s environment affect genetic variation. Which is the least supportive example?

A
changes in genetics in human populations
B
antibiotic resistance in bacteria populations
C
pesticide resistance in garden insects
D
changes in the color of the peppered moth population in England
25

In a few generations, this population of beetles changed. Which is the most likely explanation for the change?

Question illustration
A
The beetle population moved to a greener habitat.
B
A natural disaster almost caused the extinction of the population.
C
The beetle population’s food sources decreased dramatically.
D
A mutation resulted in a new color of insect.
26

Which graph represents selection that may lead to reduced variation in a population?

A
A graph has trait value on the horizontal axis and population of individuals on the vertical axis. The original population and population after selection have similar curves, but the original population peaks before the population after selection.
Option A
B
A graph has trait value on the horizontal axis and population of individuals on the vertical axis. The population after selection increases, decreases, increases, and then decreases again. The original population increases at the point that the original population drops.
Option B
C
A graph has trait value on the horizontal axis and population of individuals on the vertical axis. The original population peaks at the same time as the population after selection but the population after selection peaks higher and at a more rapid speed.
Option C
D
A graph has trait value on the horizontal axis and proportion of individuals on the vertical axis. The original population and population after selection have similar curves but the original population is slightly higher at all points.
Option D
27

Darwin hypothesized that new species could appear gradually through small changes in an ancestral species. Which observation that he made about finches most supports that hypothesis?

A
The finches all ate the same materials as the mainland population.
B
The finches were all relatively small compared to the mainland population.
C
The finches all appeared to be related but differed from the mainland population.
D
The finches were identical to the mainland population.

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