When a sperm and egg come together, the fertilized egg contains 23 pairs of chromosomes. The sex chromosomes are responsible for the genes.
Human body cells contain 23 pairs of chromosomes, parents pass their genes to their offspring through their sex cells
+ female sex cells are called ova
+ male sex cells are called sperm
Sex cells only contain one chromosome from each pair, therefore when the sex cells from ova and sperm join together it creates the 46 chromosomes, 23 pairs
Which chromosome you receive from each pair is entirely random, so different children in the same family will not look the same as they will receive different sets of chromosomes
Sex chromosomes can be seperated from its cell, if spread out on a microscope and magnified many times, longer chromosomes are X chromosomes, shorter ones are Y, females are **, males are XY
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