6.2 What is Variation

What is Variation?

• Difference between organisms caused by genetics.

• Difference between organisms caused by the environment.

• Difference between organisms caused either by genetics or the environment.

• Difference between organisms caused by radiation

Which of these is an example of variation

• Identical twins having identical DNA.

• Two potato plants that are clones of each other.

• Two Guinea pigs having different coloured fur.

• Two unrelated people both having blonde hair.

Which of the following is an example of environmental variation

• Hair colour

• Weight

• Shoe size

• Blood type

Which of the following is an example of Inherited variation?

• Eye colour

• Blood type

• Skin colour

• All of the above

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Which of the following is an example of discontinuous variation?

• Weight

• blood type

• height

• Hand span

Which of the following is an example of continuous variation?

• hair colour

• height

• eye colour

• Gender

Continuous variation is usually influenced by what?

• the environment only

• Inheritance only

• Inheritance and the environment

• none of the above

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Discontinuous variation is influenced by which?

• The environment only

• Inheritance only

• The environement and inheritance

• none of the above

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Is genetic variation essential for natural selection to occur?

• NO natural selection is to do with the environment not genes.

• YES because natural selection can only increase or decrease frequency of alleles that already exist in the population.

• NO because natural selection can create new genes that don't exist in the population.

What causes GENETIC variation

• Mutations in Ribosomes

• Mutations in DNA

• Mutations in RNA

• Mutations in Mitochondria

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