Unit 1 Test Review: 7th grade Science

Evolution _____.

• can only happen at or below the species level

• happens whenever an organism changes form or function

• is the slow change in the gene pool of a species or population

• proves that humans are descended from apes and monkeys

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A field has a population of white flowers and a population of pink flowers. If gene flow happens, _____.

• the population of white flowers will die out

• the two flower populations will become more genetically similar

• the strongest flowers from each population will survive, but the weakest will die

• the two populations will split and form their own unique flower species

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Which of the following statements is true?

• Evolution is like a ladder, with humans at the top and unicellular organisms at the bottom.

• Macroevolution cannot be observed directly. It is based on fossils and historical evidence.

• Human embryos do not share any characteristics or features with other vertebrate animal embryos.

• Evolution gives organisms what they need to survive.

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Choose all the answers that apply.

A population of rabbits is 60 percent gray and 40 percent white. An earthquake kills half of the white rabbits. What does this mean?

• This is an example of gene flow.

• This is an example of genetic drift.

• This decreases the genetic diversity of the rabbit population.

• This means the number of gray rabbits will increase over time.

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Which of the following statements is true?

• All mutations cause evolution.

• Natural selection favors organisms which are well adapted to the environment.

• Genetic drift is the only way to add new genes to the gene pool of a population.

• Horseshoe crabs have almost identical structures to fossils from 250 million years ago. This is an example of speciation.

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Which of the following statements is true?

• Genetic drift favors organisms which are well-adapted to the environment.

• If a species is well-adapted the environment, they cannot become extinct.

• The introduction of an invasive species can help protect endangered organisms.

• Species with low genetic diversity are at a higher risk for extinction than species with high genetic diversity.

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Which of the following statements correctly describes the relationship between fossils and rock strata?

• Fossils found in the rock strata are all the very small in size.

• Fossils are all found only in the top layers of the rock strata.

• Fossils found in the rock strata are all very large.

• Fossils are all found throughout the layers of the rock strata.

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Which of the following correctly organizes Mendel’s laws of hereditary from the third to the first?

• Dominance, Independence, Segregation

• Dominance, Segregation, Independence

• Independence, Segregation, Dominance

• Independence, Dominance, Segregation