Variation Flashcards

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1
Q

What is variation?

A

The differences in organisms within a species

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2
Q

Give two forms of variation.

A
  • Genetic variation
  • Environmental variation
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3
Q

What name is given to a characteristic caused by environmental variation?

A

An acquired characteristic

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4
Q

Variation influences an organism’s phenotype.

Describe one cause of genetic variation.

A

New alleles arising through mutations

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5
Q

What are mutations?

A

Changes to the base sequence of an organism’s DNA

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6
Q

(Exam-style question)

A
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7
Q

There tends to be a lot of genetic variation within a population of a species.

What is this mostly caused by?

A

Neutral mutations

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8
Q

Describe the likelihood of a genetic mutation having an effect on an organism’s phenotype.

A
  • Most mutations have no effect on phenotype
  • Some mutations have a small effect on the phenotype
  • Rarely, a single mutation will significantly affect the phenotype
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