Natural Selection

What is variation?

• Differences or changes within a group or population.

• The absence of differences or changes within a group or population.

• The process of maintaining consistency within a group or population.

• Similarities or similarities within a group or population.

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What is natural selection?

• The process by which certain traits or characteristics become more or less common in a population over time, based on their impact on survival and reproduction.

• The process by which certain traits or characteristics become more common in a population over time, regardless of their impact on survival and reproduction.

• The process by which certain traits or characteristics become less common in a population over time, based on their impact on survival and reproduction.

• The process by which certain traits or characteristics become more or less common in a population over time, based on random chance rather than their impact on survival and reproduction.

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Define evolution.

• The process of change in non-living things over generations.

• The process of change in all forms of life over a single generation.

• The process of change in only human life over generations.

• The process of change in all forms of life over generations.

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What are mutations?

• Changes in the DNA sequence of a gene or chromosome.

• Changes in the structure of a gene or chromosome.

• Changes in the protein sequence of a gene or chromosome.

• Changes in the RNA sequence of a gene or chromosome.

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How does variation contribute to evolution?

• Variation contributes to evolution by providing genetic diversity within a population.

• Variation contributes to evolution by decreasing competition among individuals.

• Variation contributes to evolution by increasing the size of a population.

• Variation contributes to evolution by causing genetic mutations.

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Explain the process of natural selection.

• Natural selection is the process of humans selecting which traits or characteristics they want in a population.

• Natural selection is the process of random mutations occurring in a population.

• Natural selection is the process of traits or characteristics being passed down from parents to offspring.

• Natural selection is the process by which certain traits or characteristics become more or less common in a population over time.

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How does natural selection lead to adaptation?

• Natural selection leads to adaptation through random mutations.

• Natural selection leads to adaptation through genetic drift.

• Natural selection leads to adaptation through the process of differential survival and reproduction.

• Natural selection leads to adaptation through Lamarckian inheritance.

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Discuss the role of genetic diversity in evolution.

• Genetic diversity has no role in evolution.

• Genetic diversity leads to extinction of species.

• Genetic diversity is only important in controlled environments.

• Genetic diversity provides the raw material for natural selection to act upon and allows for adaptation and survival in changing environments.

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In the video, Origin of Species, the naratrer made the statement that "Mutations are random. Natural Selection is not." Organize these options into the right categories to support each claim.

Groups:

(a) "MUTATIONS ARE RANDOM.:

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(b) NATURAL SELECTION IS NOT RANDOM

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(c) NOT A TRUE STATEMENT

• mutations are caused by changes in the environment

• Natural Selection favors some mutations and not others.

• The environment determis if a mutation is positive

• Mutations for positive traits are more likely to be passed on.

• Mutations happen when mistakes are made copying DNA

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A certain genetic disease only affects an organism if the individual is homozygous recessive. If two heterozygous individuals reproduce, ​ ​ (a)   ​ ​ of the offspring will suffer from the disease.

• 25%
• 0%
• 50%
• 75%
• 100%

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