According to the biological approach, which of the following statements is TRUE?
Shade one circle only.
Environment may influence the expression of the genotype.
Genotype is just the expression of the environment.
Outside influences cannot affect the expression of the genotype
Phenotype is only the expression of the genotype
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A recent study showed that Alzheimer’s disease may be partly inherited.
John’s father suffered from Alzheimer’s disease. John is keen to get genetically tested to see if he will develop Alzheimer’s disease.
Explain why John’s genotype will not reveal whether he will suffer from Alzheimer’s disease.
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Jemima and Lily are identical twins. Lily complains to Jemima, “I don’t understand it. If we have the same genes, how come you have clearer skin than me and are much better at netball?”
Jemima laughs and replies, “Lily, we may be identical twins, but we are not identical people.”
Using your knowledge of genotype and phenotype, explain Lily’s and Jemima’s comments.
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