Biology 3601A/B Lecture Notes - Lecture 1: Prothoracicotropic Hormone, Moulting, Ecdysone
11 Apr 2018
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Document Summary
Hormones are involved in growth and development of species. Insects also use endocrine signaling with hormones to drive their growth and development. Two types of development: hemimetabolous development- incomplete metamorphosis (eggs nymph adult) nymph stage, holometabolous development- complete metamorphosis (eggs larva pupa adult) larva stage is. Regulation of insect development depends on insects: decision to moult, moulting process, whether to moult into an adult or moult into another juvenile stage. Prothoracic glands (endocrine gland) in insects-regulates molting/development-necessary for proper. Brain (corpus allata) secretes ptth (peptide hormone) hormone into prothoracic glands. (eggs larva pupa adult)-each release of ecdysone gets converted to 20he which stimulates a moult. Brain (corpus allata) secretes jh (juvenile hormone)-which inhibits metamorphosis. Jh- determines the result of the moult that is produced by ecdysone. High concentrations of jh=ecdysone-stimulated moulting produces another larva stage/pupa (keeps making larva stage at high conc of jh-won"t allow pupa to turn into adult(cid:524)
