Mutations And Variations (T3) Flashcards Preview

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

Define 'mutation' in a plant..

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


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.


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


What are radiation and chemicals which cause mutations known as?



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


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.


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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