Biology (Separate Science) · GCSE · AQA · AQA GCSE Biology - Higher Tier - (8461) · Specification point · 4.6.1.8 · Inheritance, variation and evolution · Reproduction
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4.6.1.8 Sex determination
| Content | Key opportunities for skills development |
|---|---|
Ordinary human body cells contain 23 pairs of chromosomes. 22 pairs control characteristics only, but one of the pairs carries the genes that determine sex. • In females the sex chromosomes are the same (XX). • In males the chromosomes are different (XY). | |
Students should be able to carry out a genetic cross to show sex inheritance. | MS 1c, 3a |
Students should understand and use direct proportion and simple ratios in genetic crosses. |