Biology 1202B Lecture Notes - Lecture 19: Embryonic Stem Cell, Gene Expression, Telomerase
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22 Aug 2019
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Bio1202b: lecture 19 control of gene expression ii. Organisms can develop to the level of complexity observed because of temporal and differential gene expression. The inner mass cells are the embryonic stem cells of the zygote, and they produce the organism. Have the potential to develop into different cell types in the body during embryogenesis and adult life, although more prominent in the former because an entire range of cells is being formed. Stem cells express telomerase, but not to the degree of cancer cells. There are 4 types of stem cells: embryonic stem cells. Inner mass cells of the blastocyst: somatic (adult) stem cells. Induced pluripotent stem (ips) cells: umbilical cord stem cells. Totipotent stem cells can differentiate into embryonic and extraembryonic cell types creating a complete, viable organism: only are zygote and its first few cell divisions classify.
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