Maya and Elena are identical twins. Maya says to Elena, "Since we share 100% of our genetic material, it's weird that you have developed such strong, muscular calves from training for marathons and have a deep suntan, while my legs are much less muscular and my skin is very pale."
Elena replies, "Well, Maya, our genetic code is only a blueprint. The way we actually look and perform depends on how our lives shape us."
Using your knowledge of genotype and phenotype, explain Maya's and Elena's comments.
48 exam-style questions on AQA A Level Psychology Biological approach. Each one has a worked solution and a mark scheme showing where the marks go.