18.2: Variation in Phenotype Flashcards

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1
Q

What do individuals in a population of a species often show

A

A wide range of variation in their phenotype

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2
Q

What is this variation in their phenotype due to

A

Genetic Factors

Environmental Factors

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3
Q

What is the primary source of variation

A

The primary source of variation is mutation

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4
Q

What are the 3 sources of variation

A

Mutation (Primary)

Meiosis

Random fertilisation of Gametes

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5
Q

Is variation ever due to one source of variation

A

No, it is often a combination

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6
Q

How do genetic differences occur in a population if every member has the same genes

A

Genetic differences occur due to members of the population having different alleles of the genes

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7
Q

Where/when do these differences occur

A

In living organisms

From generation to generation

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8
Q

Genetic differences as a result of mutations

A

Sudden changes to genes and chromosomes may be passed on to the next generation

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9
Q

Genetic differences as a result of meiosis

A

Meiosis is a special form of nuclear division, producing NEW combinations of alleles

These new combinations are produced before they are passed into the gametes, therefore they are different

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10
Q

Genetic differences as a result of random fertilisation of gametes

A

In sexually reproducing organisms, new combinations of alleles are produced and therefore their offspring are different

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11
Q

Which method does genetic differences occur by

A

A combination of all 3. A genetic difference as a result of just one is very rare.

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12
Q

What other factors influence the way genes are expressed

A

Environmental factors, they exert an influence on all organisms

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