Biology - Variation Flashcards

1
Q

What is continuous variation?

A

Impacts lots of genes, no discrete categories, is affected by the environment eg. height or intelligence

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2
Q

What is discontinuous variation?

A

fits into discrete categories, impacts by a few genes and is not affected by the environment eg. blood group, genetic disorders

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3
Q

What is variation?

A

The differences in characteristics between individuals

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4
Q

What is inherited variation?

A

variation caused by the genetic material you inherit from your biological parents

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5
Q

Why is variation important for the survival of a species?

A

It is important as if the environment changes, some individuals will be able to survive so the species will not become extinct

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6
Q

What does it mean if there is not much variation within a species?

A

It means that all the individuals will have similar alleles and characteristics, so it is more likely that the species will go extinct

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7
Q

What is a problem with selective breeding?

A

By breeding animals/plants for particular genetic characteristics, the species may all end up having the same alleles and characteristics, so if their environment changes, they may all go extinct

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8
Q

What is the process of selective breeding?

A

select individuals with the desired traits
breed them together
select the offspring with the desired traits
repeat over many more generations until all the offspring have the desired characteristics

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9
Q

What is Inbreeding?

A

inbreeding is the process of breeding close relatives within the family

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10
Q

What is variation between different organisms caused by?

A

genetic differences
environmental differences
a combination of the two

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