• Crossing-over is the exchange of genetic material between homologous chromosomes.
  • It results in new combinations of genes on each chromosome.
  • Sexual reproduction results in offspring that are genetically unique.
  • Each human couple has the potential to produce more than 64 trillion genetically unique children.
  • Together with random fertilization, more possibilities for genetic variation exist between any two people than the number of individuals alive today.
  • In humans, over 8 million (223) chromosome combinations exist in the production of gametes in both the male and female.
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