Question

Cleavage in a chick is called discoidal type,why?

Answer 1

It is a mnemonic of two words: discoidal + blastula = discoblastula. So it suggests that cleavage is partial discoidal in birds. Embryo forms disc. Cells called blastodisc are on top of the yolk. It seems that the formed disc is blastodisc.

Answer 2

$HERE \: IS \: YOUR \: ANSWER$

It is a mnemonic of two words: discoidal + blastula = discoblastula. So it suggests that cleavage is partial discoidal in birds. Embryo forms disc. Cells called blastodisc are on top of the yolk.

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