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Human sex chromosomes

Human sex chromosomes

Humans have 232323 pairs of chromosomes in most body cells. One pair consists of the sex chromosomes, while the other 222222 pairs are autosomes.

3.3.4 Determination of sex at fertilisation Lesson

  1. GCSE
  2. /Biology
  3. /3.3.4 Determination of sex at fertilisation

Step-by-step lessons on Edexcel GCSE Biology 3.3.4 Determination of sex at fertilisation. Each one builds up to exam-style questions. Start with the foundational topics and build up to the higher-tier material.

Lessons