(a(i))[2]
State the names of the four chemical elements present in all proteins.
(a(ii))[1]
State the function of haemoglobin.
(b)[2]
Suggest how the shape of the abnormal red blood cell in Fig. 2.1 will influence blood flow.
(c)[5]
Draw a genetic diagram to work out the probability that two heterozygous parents will have a child who lacks the Hb$^S$ allele.
(d(i))[5]
Using the information in Fig. 2.2 and Fig. 2.3, Discuss the evidence for and against this statement for regions A, B and C only.
(d(ii))[1]
Suggest how the scientists would identify whether the Hb$^S$ allele is present in tissue samples.
(e)[4]
Mutations are inherited every time in single-celled organisms that reproduce asexually, but they are not always inherited in organisms that reproduce sexually. Explain why.