(a(i))[3]
State the names of the structures labelled X, Y and Z in Fig. 5.1.
(a(ii))[1]
State what controls the order of amino acids in the protein that is formed.
(a(iii))[2]
Explain why the order of amino acids matters when receptor molecules for neurotransmitters are made.
(b)[2]
Explain why body cells can carry out different specialised roles even though they have the same genes.
(c)[1]
In a population, allele frequency may be changed by natural selection and artificial selection. State the meaning of the term allele.
(d)[3]
Describe how artificial selection is different from natural selection.
(e)[2]
Mutation creates new alleles, which increases genetic variation. State two other sources of genetic variation in populations.