Section B1h: Understanding Ourselves - Who am I?

This item provides the opportunity to show that there are some questions that science cannot address and that technology may raise ethical issues when debating arguments for and against parents knowing a baby's genetic make-up before birth.

Suggested activities and experiences to select from:

Use poppit beads to show combinations due to chance; Toss coins to show expected and 'real' ratios; Use a genetics kit to show the results of a monohybrid cross; Debate the arguments for and against parents knowing a baby's gender before birth.

Assessable learning outcomes:

Foundation Tier only:

Analyse human characteristics to determine those caused by the environment:

• scars, spoken language.

Those controlled by genes and so inherited:

• earlobe shape;
• eye colour;
• nose shape.

Those which are a result of both environmental and inherited factors:

• intelligence;
• body mass;
• height.

State that some disorders are inherited: red-green colour blindness, sickle cell anaemia, cystic fibrosis

Both tiers: Recall that inherited diseases are caused by faulty genes.
Higher Tier only: Explain that inherited disorders are caused by faulty alleles, most of which are recessive. Use genetic diagrams to predict the probabilities of inherited disorders passing to the next generation. Discuss the issues raised by knowledge of inherited disorders in a family.