Answers25.26 TCEC BIO 1Populations and the Environment

Lab: Natural Selection Answers

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Veronica wrote Charles Darwin’s main points on the board, but she made a mistake in one point.1. Since more offspring are produced than an environment can support, organisms within a population must compete for resources to survive.2. Due to variations within the population, some competitors will be better equipped for survival than others.3. The best-equipped organisms will survive and will produce well-equipped offspring. 4. Variations that help with survival will be passed on to future generations and will rapidly change the whole population.Which point is flawed as written above?

A
point 1
B
point 2
C
point 3
D
point 4
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A frog has more offspring than can survive on available resources.Of which is this an example?

A
structural adaptation
B
overpopulation
C
variation in a population
D
artificial selection
3

Which organism exhibits behavioral adaptation?

A
an owl with large pupils and eyes that enable it to see better at night
B
a possum playing dead to increase its chances of survival
C
an insect that mimics its environment to hide from its predators
D
a desert plant that sheds its leaves to lessen water loss during the dry season
4

Natural selection is a process by which organisms that are better adapted to their environment tend to

A
increase in size.
B
migrate.
C
evolve new traits.
D
survive.
5

Consider this image of a gazelle.Which of the gazelle’s naturally selected traits is shown in this picture to be an evolutionary advantage?

Question illustration
A
feeding only at certain times of the day
B
coat color for blending in with dry grass
C
specialized gut due to a diet of grasses
D
specific gender roles to diminish predation
6

Which best describes the relationship between evolution and natural selection?

A
Natural selection leads to evolution.
B
Evolution leads to natural selection.
C
Natural selection is the same as evolution.
D
Evolution and natural selection are not related.
7

A population of rabbits has individuals with fur coloring that ranges from white to brown. The population lives in a temperate deciduous forest where the summers are mild and average about 50°F. The winters are often below freezing. If warmer temperatures last longer into the fall and the average temperature in the winter is getting warmer, what do you expect to happen to the population?

A
The percentage of the population with brown fur will decrease.
B
The percentage of the population with white fur will decrease.
C
The population will increase in size, but the color percentages will remain unchanged.
D
The population will decrease in size, but the color percentages will remain unchanged.
8

Which would least likely be a cause of natural selection?

A
adaptation
B
evolution
C
overpopulation
D
variation
9

Which was Charles Darwin’s contribution to the study of biology?

A
He was the first person to recognize that organisms change over time.
B
He believed that organisms adapted through the inheritance of acquired traits.
C
He explained how traits are passed from parents to offspring.
D
He proposed that natural selection is the primary mechanism of evolution.
10

Charles Darwin observed a unique beak size and shape in the finch population of each of the Galapagos Islands that he visited. Which is the most likely cause of the observed variation?

Question illustration
A
differences in the climate among the islands
B
competition among individuals for available food sources
C
competition among individuals for desirable mates
D
differences in egg size among the populations

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Lab: Natural Selection Answers — 25.26 TCEC BIO 1