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TLS Online TPP Program

#Question id: 5131

Differentiated cells express the genes and proteins characteristic of their final identity in the adult, and that identity can be altered only under special circumstances. How does the concept of differentiation, as described here, differ from the concept of determination?

#Unit 5. Developmental Biology

  1. Determined cells have begun to differentiate, but are not fully differentiated.

  2. Determined cells are embryonic cells that will give rise to all the cell types of the adult organism, but have not yet begun to express the genes and proteins characteristic of their final fates.

  3. Determined cells will continue to follow their fate if grafted into a different place in a host embryo, even though they do not yet express the genes and proteins characteristic of their final fate.

  4. Determined cells are embryonic cells that will form certain cell types and structures if development is allowed to proceed normally, but will alter their development in response to their location if transplanted to a different place in a host embryo.

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TLS Online TPP Program

#Question id: 4632

#Unit 11. Evolution and Behavior

Which of these conditions should completely prevent the occurrence of natural selection in a population over time?
TLS Online TPP Program

#Question id: 4633

#Unit 11. Evolution and Behavior

Natural selection is based on all of the following except
TLS Online TPP Program

#Question id: 4634

#Unit 11. Evolution and Behavior

Which of the following represents an idea that Darwin learned from the writings of Thomas Malthus?
TLS Online TPP Program

#Question id: 4635

#Unit 11. Evolution and Behavior

Which statement about natural selection is most correct?
TLS Online TPP Program

#Question id: 4636

#Unit 11. Evolution and Behavior

Given a population that contains genetic variation, what is the correct sequence of the following events, under the influence of natural selection?

1. Well-adapted individuals leave more offspring than do poorly adapted individuals.

2. A change occurs in the environment.

3. Genetic frequencies within the population change.

4. Poorly adapted individuals have decreased survivorship.
TLS Online TPP Program

#Question id: 4637

#Unit 11. Evolution and Behavior

A biologist studied a population of squirrels for 15 years. During that time, the population was never fewer than 30 squirrels and never more than 45. Her data showed that over half of the squirrels born did not survive to reproduce, because of competition for food and predation. In a single generation, 90% of the squirrels that were born lived to reproduce, and the population increased to 80. Which inference(s) about this population might be true?

A) The amount of available food may have increased.

B) The number of predators may have decreased.

C) The squirrels of subsequent generations should show greater levels of genetic variation than previous generations, because squirrels that would not have survived in the past will now survive.

Choose correct combination,