Write short notes on
vertebrae eye field
oogenesis in amphibians
Complete metamorphosis in insects
Origin of blastemal cells during regeneration in planarians.
Answers
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1) VERTEBRAE EYE FIELD
The first morphological evidence of eye formation in vertebrates is a bilateral expansion of tissue from the early forebrain to form the optic vesicles. It has been known for nearly 70 years, however, that presumptive eye tissue (eye field) exists prior to optic vesicle formation.
2)oogenesis in amphibians
Oogenesis is the process by which female germ cells undergo meiosis and differentiation into mature oocytes. The germ cells form oogonia, which proliferate before they enter meiosis. ... During folliculogenesis, the amphibian oocyte increases in size because of incorporation of the yolk protein vitellogenin.
3)Complete metamorphosis in insects
Complete Metamorphosis Has Four Stages: Egg, Larva, Pupa, and Adult. ... Butterflies are an example of an insect that goes through all the stages of complete metamorphosis. Complete metamorphosis begins with the insect hatching from an egg into a soft worm-like shape called a larva.
4)Origin of blastemal cells during regeneration in planarians.
Some planarians, on the other hand, can regrow their entire bodies — even their heads, which only a few animals can do. Key to planarians' regenerative ability are powerful cells called pluripotent stem cells, which make up one-fifth of their bodies and can grow into every new body part.
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