3.1.2

Question 1

mutation

Answer 1

a permanent change in the base sequence of DNA

Question 2

what does mutation create?

Answer 2

new alleles

Question 3

base-substitution mutation

Answer 3

a mutation that changes 1 nitrogenous base in a sequence

Question 4

silent mutation

Answer 4

change in base sequence has no effect on amino acid produced

bcos genetic code has multiple codons (triplets) for the same amino acid

Question 5

missense mutation

Answer 5

change in base sequence cause 1 different amino acid to be produced

result: polypeptide formed might work differently or not at all

Question 6

3 causes of mutations

Answer 6

1. due to fast enzymatic process of DNA replication mechanism….so result in error
2. exposure to radiation and some chemicals (mutagens!)
3. base substitution- where 1 base in the sequence of a gene is replaced by a different base