BIOL 111 Lecture Notes - Lecture 10: Symmetry In Biology, Germ Layer, Blastomere

• School: McGill University
• Department: Biology
• Course: BIOL 111
• Professor: Rudiger Krahe

Document Summary

Biol 111 lecture 10 embryonic development & symmetry: cnidarians & Lecture date/time: oct 13th, 2015 / 10:35-11:25 am. Zygote 1st cell of the next generation of multicellular organisms (2n), a diploid cell results from the union of 2 haploid gametes. Embryo = young animal or plant while it is still contained within a protective structure (ex. seed coat, eggshell, uterus, etc) not exposed to the environment. Cleavage = 1st cell divisions in the embryo; the zygote (1 cell) is cleaved into. ; the process of forming many cells from one cell. Gastrulation = in-folding/invagination; gives the multicellular ball (=morula) some shape; process of forming embryonic tissue layers (2-3) from the 1st layer of cells; has to do with the formation of the intestines. Two cell layers of late gastrula (germ layers): Ectoderm ( outer skin ) epidermis, will form nervous system. Endoderm ( inner skin ) will become lining of digestive system & respiratory system.