The criminal gene

1 	The final form of an organism - its appearance and behaviour - is called the 	phenotype. It is a result of the interaction of its genotype and the 			environment in which it develops. Explain carefully in your words what is 	meant by the terms genotype and phenotype.

2 	Using human examples, explain how the environment can influence 		specified phenotypic features.

3 	Give examples of features or characteristics which are exclusively under 		genetic control.

4 	The passage mentions Huntingdon's Chorea. Find out the symptoms of this 	disease and explain how it is inherited.

5 	Huntingdon's Chorea is a serious condition, which eventually kills those 		inflicted with it. Why has it not been removed from the population by 		natural selection?

6 	Today it is possible for couples who carry a gene for an inherited disease to 	be offered genetic counselling before they have children. What is meant by 	genetic counselling? Suggest one disease, other than those already 			mentioned, for which carriers may benefit from genetic counselling.
	
8 	Do you think there are situations in which a person's genetic make-up can 	predispose an individual to crime or antisocial behaviour? Give reasons for 	your answer.