BIOLOGY 172 Chapter Notes - Chapter 20.1-20.3, 28.3: Cadherin, Antennapedia, Pax6
Document Summary
Totipotent means it can give rise to a whole organism. Zygote is the fertilized egg which undergoes successive mitotic cell divisions as it moves along a fallopian tube morula (ball of cells) Blastocysts are hollow spheres produced by cells in the morula that move in relation to one another; has an inner cell mass and only occurs in mammals. Inner cell mass is a mass of cells in one region of the inner wall of blastocyst from which the body of embryo develops. Gastrula is a layered structure formed when the inner cell mass of blastocyst migrates and reorganize into three germ layers which are sheets of cells including the ectoderm, mesoderm, and endoderm form differentiated cells. Ectoderm includes outer layer of skin and nerve cells in brain. Mesoderm includes cells that make up inner layer of skin, muscle cells, red blood cells. Endoderm includes cells of lining of digestive tract and lung, liver cells, pancreas cells.
