Question
What is the major modification that occurs in reptilian aortic arches?
In the evolutionary transition from fish to reptiles, significant modifications took place in the aortic arches, which are blood vessels responsible for carrying blood from the heart to different parts of the body. In reptiles, the major modification occurred in the ___________ ___ _________ _________ _____________ _______ ______ ____________ _________ _____ __________.
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__________ ___________.
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Indicate the following changes that occur during metamorphosis in amphibians either as progressive or regressive or remodeling:
a) The development of middle ear in connection with the pharyngeal pouch.
b) The change in the shape of the mouth and the shortening and reduction of the cloacal tube.
c) Disappearance of lateral line organs of skin and reduction of blood vessels.
d) The differentiation of brain.
e) The changes in the portal system and the changes in the vascular system to supply blood to the lungs.
What is the major modification that occurs in reptilian aortic arches?
What is the difference between juxtacrine and paracrine signalling.
Which common maternal diseases can lead to flaws in development? Explain.
Give five features that you can use to distinguish between the skulls of frog and rabbit.
List at least three stages in gene expression that can be regulated to result in differentiated cell types? Explain any one of them with the help of an example
a) In fishes the …………………. covers the brain and spinal cord.
b) Reptiles and birds have a double membrane made up of …………… and …………………. to protect the brain.
c) In lower vertebrates the epithalamus forms …………………. and …………………. .
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