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what are the similarities & differences between sea urchin and chick in term of development ?

what are the similarities & differences between sea urchin and chick in term of development ?

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Answer #1

The similarities between sea urchin and chick are that they both undergo cleavage to form cells known as blastomeres; collectively known as blastula. Gastrulation i.e the movement of surface cells into the interior occurs both in sea uchin as well as chick.

The differences between sea urchin and chick in terms of development are:

Sea Urchin Chick
Maturation of the Sea Urchin takes place early. The maturation process is much longer.
It forms a blastula following 24 hours of development; the blastula is a free swimming form and can fend for itself. The maturation time of chick is longer and it takes time of about 3 weeks prior to hatching.
There are no pre hatching stages. There are several pre hatching stages. Moreover, it requires the presence of egg shell for its protection and gaseous exchange. Yolk sac is present in the egg to supply it with nutrients.
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