Mutations And Variations (T3) Flashcards Preview

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Flashcards in Mutations And Variations (T3) Deck (7):
1

Define 'mutation' in a plant..

A mutation is a change in the genetic material of the plants

2

Sometimes mutations in a plant can be beneficial. Why is this, and give an example..

Because is causes 'vibrations'.

Some of the fungi exposed to the Chernobyl nuclear accident developed a form of nuclear resistance.

3

Why are 'variations' of a species important?

- they can help with the survival of the species
- if the mutation is present in the sex genes it can be passed onto the next generation

4

What are radiation and chemicals which cause mutations known as?

Mutagens

5

How could you speed up mutations artificially? Give two examples..

- using ionising radiation such as X-rays, gamma rays and ultra violet rays
- chemicals such as those found in tobacco

6

What happens to the structure of DNA in a mutation?

There is a change in the sequence of bases in the DNA molecule. This causes either a different protein to be made of it blocks the production of the protein completely.

7

Describe an example of a bacteria mutation and explain why it is - in some ways - beneficial..

The mutation of some bacteria so they can no longer be killed by our antibiotics:

- within 10 years of penicillin being made available, one type of bacteria had become resistant to it
- new types of antibiotics were produced but each time some bacteria became resistant to it because a tiny part of their gene changed
- these are known as MRSE bacteria and are now resistant to all but one type of antibiotic
- whilst not beneficial to humans, these mutations have been very beneficial to the bacteria

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