Why Cleavage in Birds Is Discoidal?
Meroblastic: Lines of Segmentation Do Not Completely Pass Through Egg & Remain Confined to a Part of Egg. .. . as Birds Has Megalecicithal Eggs, the Yolk...
meroblastic : lines of segmentation do not completely pass through egg & remain confined to a part of egg. ... as birds has megalecicithal eggs, the yolk provides resistance to cleavage, hence the cleavage is meroblastic & discoidal.
What is Discoidal cleavage?
: meroblastic cleavage in which a disk of cells is produced at the animal pole of the zygote (as in bird eggs)
Do birds have Meroblastic cleavage?
Like fish eggs, the yolky eggs of birds undergo discoidal meroblastic cleavage. Cleavage occurs only in the blastodisc, a small disc of cytoplasm 2–3 mm in diameter at the animal pole of the egg cell.
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