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Chapter 2.2 ­ The basics of genetics

Phenotype ­ Physical and chemical characteristics that make up the appearance of an organism. The
phenotype is partly the result of the genetic information (genotype) passed from parents to
offspring and partly the effect of the environment in which the organism lives.


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Each chain is arranged around an iron-containing haemoglobin group.

Depending on the type of the disease, thalassaemia prevents the formation of either the alpha or
beta haemoglobin chains.

Alpha thalassaemia ­ It is inherited from genes in two loci on chromosome 16. So there are a total
of four genes,…


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