CAIE IGCSE Biology 17.1.4 Inheritance of Sex in Humans

Practise using X and Y chromosomes and genetic diagrams to explain the inheritance of biological sex in humans.

Exam points

state that females are XX and males are XY
show that egg cells carry X while sperm cells carry either X or Y
use a genetic diagram to predict equal probabilities of XX female and XY male offspring

[Maximum number: 3]

Sex in cats is determined in the same way as in humans.
Complete the diagram below to show how sex is determined in cats.

\text { male cat } \times \text { female cat }

offspring ratio

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