B5 Growth and Developement PAGE 3

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  • Nuclear of sperm and egg join up.
  • The Zygote gets on set of chromosomes from each parent.

What's a DNA?

  • A chromosone is a long molecule of DNA wound around a protein framework.
  • A human DNA molecule is made up of about 30,000 genes.

A DNA is a double helix (two strands twisted togetherin a spiral)

  • Bases connect…


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