X and Y chromosomes / genetic cross diagrams

• 23 pairs in a normal body cell (46 individual)
• 22 of these matched pairs control characteristics
• The 23rd pair are labelled ** or XY, they decide your sex.
• Males have XY and Females have **
• When the gametes are made its a 50/50hance that a sperm cell will get the X or the Y chromosome.
• All egg cells have X as their alleles are ** there homozygus.

Genetic diagrams are just models that are used to show the possible genetic outcomes.

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Family…