Natural Selection

Natural Selection

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When traits give individuals an advantage to survive longer and
reproduce more, passing them on to the next generation.

Natural Selection

-The more an organism reproduces,
the more those beneficial traits are
passed on in the population.

→ Increases that allele’s frequency.

-Natural selection impacts the
population not the individual.

Vocab Help
Frequency = how often something occurs

Multiple Choice

Which of the following best describes the relationship between natural selection and adaptation?

• There is no relationship between natural selection and adaptation.

• Adaptations and natural selection are both mechanisms by which beneficial genes are passed from a parent to an offspring.

• Adaptation is the transfer of allele in a population which allows an organisms to be better suited to its environment.  Natural selection is the process by which an adaption is passed to offspring.

• An adaptation is a beneficial trait that allows an organism to be better suited for survival in its environment.  Natural selection is the process by which beneficial traits are passed on to offspring in subsequent populations.

Multiple Choice

Bacteria can develop a mutation that allows them to survive antibiotics and live long enough to reproduce.  The mutation in the genetic material of the bacteria spreads to subsequent generations and the bacteria with the gene will survive and increase in number.

Which of the following terms best describes this phenomena?

• Natural Selection

• Founder Effect

• Genetic Drift

• Gene Flow

Artificial Selection

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When humans select and breed organisms for specific traits.

-Regulated or controlled breeding.

-Often associated with the domestication
of a species.

Multiple Choice

In artificial selection what is selecting the "Fit" traits?

• Humans

• Nature

Multiple Choice

In artificial selection, humans breed together organisms for traits we desire. In natural selection, the environment selects for traits that...

• nature desires or wants to see.

• allow the organism to live long and reproduce more offspring.