[问答题]
The maps show the incidence of sickle cell anae
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m f,k2bot1az(ntinent of Africa.
The graph shows the average density of malarial parasites present in the blood of Hb AA (not affected by sickle cell anaemia) and Hb AS (carriers of sickle cell anaemia) people in Sub-Saharan Africa.
1.Compare and contrast between the distribution of sickle cell trait and malaria in Africa.
2.1.State the mode of inheritance of sickle cell anaemia.
2.2.Using a genetic diagram, determine the probability of a child having sickle cell anaemia, if both their parents are carriers of the disease.
3.Blood samples were taken from children to create the graph. Suggest one difference between the appearance of blood cells in Hb AA and Hb AS samples.
4.State at which age there is the largest difference between the number of parasites found in the blood of Hb AA and Hb AS samples.
5.Suggest one difficulty of collecting sufficient data for this study.
6.Using your own knowledge and the data provided, discuss whether carrying the sickle cell allele offers protection from malaria.
