11651794
Description
Flashcards by lily bevan, updated more than 1 year ago
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Created by lily bevan
almost 9 years ago
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| Question | Answer |
| What is a mutation? | A change in the sequence of bases in DNA. |
| What can cause mutations? | Some substances (including substances in cigarette smoke), by ionising radiation, but mostly by errors when DNA is copied. |
| What is point mutation? | When a nucleotide is substituted for another. |
| Why may point mutation not cause any effect? | Because several different triplets can code for the same amino acid. |
| What is insertion mutation? | When an extra amino acid is added, changing the way the bases are divided into triplets. |
| What is election mutation? | When an amino acid is removed, changing the way the bases are divided into triplets. |
| What happens when there is copying error when gametes are made? | If the gamete is fertilised, every cell of the developing organism will have the variant. |
| What are some effects of a mutation in offspring? | They could be harmful, either causing diseases, or causing the embryo to die. Or they could help the organism to survive better. |
| What happens if mutation happens in non-coding DNA? | Gene expression could be affected. |
| What is an example of a beneficial mutation? | Opposable thumbs. |
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