During embryonic development,the establishment of polarity such as anterior/posterior,dorsal/ventral,and medial/lateral axes is called:

  • A
    Anamorphosis
  • B
    Pattern formation
  • C
    Organizer phenomenon
  • D
    Axis formation

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In which of the following is polyspermy common?

The enzyme secreted from the acrosome of a frog's sperm is:

$A$: In frog,a gray crescent is formed during fertilization.
$R$: It is because the black pigment granules move away from the point of entry of the sperm in the animal half.

What type of cleavage occurs in a mesolecithal egg?

The rolling of endodermal and mesodermal cells from the surface of the embryo into its interior is called

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