Seastar Lab Report

Decent Essays
During this lab observations of the external and internal structures of seastars were examined through dissection. Most notably, seastars are creatures that are deuterostomes.
First of all, deuterostomes are organisms within Echinodermata and Chordate phylum that developed anus first. The egg for echinoderms have a little quantity of yolk that allows the egg to divide in its first and second cleavage stage into four equal blastomeres; this is also known as holoblastic cleavage. Although, if the egg is macrolecithal then it will undergo meroblastic cleavage, in which the embryo can divide in a restricted space that is yolk-free in the cytoplasm (small dic area). Within the cleavage stage of the embryo it is radial and indeterminate meaning that

Related Documents