BIOL 303 Lecture Notes - Lecture 10: Apical Ectodermal Ridge, Maximum Life Span, Blastema
16 Oct 2011
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Describe briefly the changes in these systems between larval and adult forms. All changes are initiated by thyroid hormones thyroxin (t4) and triiodothryonine (t3). There are different tissue responses and timing of expression of various derivatives of thyroid hormones. T3 or t4 hormones instruct limb bud muscles to grow and tail muscles to undergo apoptosis. Organ specific programmed response is when there is specific responses to thyroid horomone tail transplanted onto trunk is still sensitive to apoptosis and re-absorption: list and briefly describe three types of metamorphosis in insects. Insect metamorphosis involves the destruction of larval tissues and replacement by entirely different population of cells. Holometabolous- larva, pupa, adult: list and briefly describe three main types of imaginal cells in insects. Imaginal discs- form wings, legs, antennae, eyes, head, thorax, and genitalia. Epimorphosis- dedifferentiation into an undifferentiated mass followed by respecification. Stem cell mediated regeneration- regrowth of certain organs or tissues that have been lost (continual replacement of blood cells)
