ZOO 3050 Lecture Notes - Lecture 4: Neoteny, Axolotl, Zygote

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Cleavage cycles will keep the embryo the same size or even shrink (energy is being used up), until they actually start taking in exogenous food. This is when they grow as a function of cell division. Before this it is just a division of the egg (cutting the pie into pieces). In the vegetal region of the frog embryo (frog zygote, embryo starting to develop) there is an area that is darker and higher in density. The area in which the primary germ cells can actually develop: they also provide support for the development of the cells, germ plasm migrates into the genital ridge during gastrulation and subsequent organ development. These cells are very different from the surrounding environment. Germ cell determination in nematodes: finite number of cells, every cell becomes an adult cell. Characteristics of early developing pgcs: gene expression, translation of genetic information (dna) is basically suppressed, pgs specific suppressors, pie-1 (c. elegans, gc1 (drosophila)

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