7.2: Natural Selection Flashcards

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1
Q

What is a phenotype?

A

The organism’s physical characteristics

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2
Q

What does natural selection act on (phenotype or genotype)?

A

Phenotypes

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3
Q

What does natural selection modify (phenotype or genotype)?

A

Genotypes

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4
Q

How does natural selection act on and modify different levels of genes?

A

An phenotype that is best suited to the environment will be selected for, and the genes of subsequent populations will be modified to reflect the advantageous phenotype.

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5
Q

What are selective pressures?

A

Abiotic or biotic factor that is able to influence survival of an organism (disease, climate, food avial, ect)

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6
Q

How does an environment apply a selective pressure to a population?

A

It determines which adaptations are affordable depending on the environmental conditions.

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7
Q

Identify one examples of a phenotypic variation that increases fitness of an organism in a particular
environment.

A

Dark colored flies were able to better blend in with trees that were covered in soot, so they had increased fitness as they were able to reproduce more.

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