Unit A Section 2.1 Flashcards

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1
Q

Can all variation be seen:

A

No, some variation cannot be seen with a bare eye.
For example, humans have different blood types
Some jack pines can resist drought more than other jack pines.

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2
Q

How do scientist understand variation:

A

scientists may explore which characteristics species pass along from generation to generation, and how these characteristics show up in individuals.
Also, examine the role of the environment in variation.

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3
Q

Heritable characteristics

A

are passed on from generation to generation

ex. eye color, height, skin color

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4
Q

Non-heritable characteristics

A

they are not passed on to other generations.

ex. piano skills and some disease or scars

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5
Q

What are the two types of variations

A

Discrete and Continuous

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6
Q

Discrete variation

A

refers to differences in characteristics that have a defined form. You can think of discrete variation as being the “either/or” form of a characteristic

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7
Q

Continuous variation

A

refers to differences in characteristics that have a range of forms. They are not one form or another. For example, the height of adult humans can range from 1.2 m to 2.1 m. In squirrels, mass can range anywhere between 133 g and 249 g.

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8
Q

Can variation also result from interactions

A

Yes.
Some variations in individual organisms result from interactions with the environment.
Height is a heritable characteristic. But height can be affected by diet

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