The life cycle of the common fruit fly begins with the egg stage. About one day after the egg is laid, a
larva will emerge from the egg. In four days it goes through 3 developmental stages called instars, and
then forms a pupa. Adult tissues will begin to grow inside the pupa, and at the end of four days an adult
fly is born.
Precocene is a chemical that inhibits juvenile hormone synthesis. If precocene is added to fly media
before flies begin to reproduce, then the offspring of the flies will be smaller and lower in number
compared to uninhibited JH flies, because it is unable to effectively move into the pupa stage of the life
cycle. This is due to the important effect of juvenile hormone on the developmental stages of d.
melanogaster. If this is correct, the data will demonstrate a lower number of flies produced compared to
normal flies, and the size of the flies would be smaller.
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