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5.1 Chromosomes, Genes and DNA

  • Can you recall that genes are located on chromosomes in the nucleus of a cell?
  • Can you recall that DNA can be sectioned into genes?
  • Are you able to describe the structure of a DNA molecule as two coiled strands that form a double helix, the strands being linked by a series of paired bases?
  • What are the haploid and diploid numbers in human cells?
  • What is an allele?
  • What is a genetic mutation?
  • What can cause the incidence of mutations to increase?

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Watch this video to learn what DNA is and how it works

With arms twice as long as its legs and curved bones an orang-utan is perfectly suited to live in its environment. These adaptations are encoded in information passed down in their DNA. In this video Brian Cox takes a closer look at this genetic code.

Click here to see how chromosomes are located inside the nucleus of cells.

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Extension material

Click here to learn a little more about how DNA codes for proteins in your cells.

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