ERROR: Content Element type "pure_img_pi1" has no rendering definition!

An allele is any one of a number of alternative forms of the same gene (sometimes the term refers to a non-gene sequence) occupying a given locus (position) on a chromosome. An example is the gene for blossom color in many species of flower - a single gene controls the color of the petals, but there may be several different versions of the gene. One version might result in red petals, while another might result in white petals.

Source: Wikipedia
  American sign language »