One differance between mammalian and avian development is a. the presence of hen

ID: 47787 • Letter: O

Question

One differance between mammalian and avian development is

a. the presence of henson's node (or its equivelant) in avian and not in mammalian development

b. delamination to form a hypoblast only occurs in avian development

c. asynchrony of cleavage divisions occurs in mammals but not in birds

d. development of the notochord is an almost immediate process in avian but not in mamalian gastrulation

In embryonic development, compaction is

a. a huddling together of blastomeres to maximize contact

b. a loss of certain numbers of unnecessary blastomeres

c. the same type of process as convergent extension

d. the same type of process as intercalation

e. none of the above

Which of the following transcription factors/expressible proteins is NOT involved in left/right axis formation?

a. Lefty-1

b. snail

c. retinoic acid

d. activin

Answer 1 - c. asynchrony of cleavage divisions occurs in mammals but not in birds

Answer 2- a. a huddling together of blastomeres to maximize contact

Answer 3 - a. Lefty-1

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