X and Y Chromosomes

X and Y Chromosomes

1. 22 pairs of chromosomes are in every human body cell

   • The 23rd pair of chromosomes are labelled XX or XY
     • These control your Gender

2. All Men have XY chromosomes

   • Y-Chromosomes cause male characteristic

3. All women have XX chromosomes

   • XX combination allows female chromosomes to develop

4. When sperm are being made, the X-chromosomes and Y-chromosomes drawn apart during first division in Meiosis

   • 50% chance that each sperm has a X-chromosomes or an Y-chromosomes

5. Genetic diagrams show the possible combinations of gametes

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