• Regulation of gene expression is extremely important during the development of an organism.
  • Regulatory proteins must turn on certain genes in particular cells at just the right time so the organism develops normal organs and organ systems.
  • Homeobox genes are an example of genes that regulate development.
  • They code for regulatory proteins that switch on whole series of major developmental genes.
  • In insects, homeobbox genes called hox genes ensure that body parts such as limbs develop in the correct place.
  • A mutation in a hox gene can affect an insect’s development.
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