Tissue containing totipotent embryonic stem cells is difficult to obtain; what is the usual source?
A) donated blastocysts produced by in vitro fertilization for women seeking fertility treatment
B) tissues from spontaneous miscarriage during the first trimester of pregnancy
C) blood and tissues extracted from the placenta after the birth of the fetus
D) cloned embryos produced by fusing a somatic cell with an enucleated egg cell

Question

Quizplus · Accepted Answer

Donated blastocysts produced by in vitro fertilization for women seeking fertility treatment are the usual source of tissue containing totipotent embryonic stem cells. These blastocysts are typically not implanted and would be discarded if not donated for research purposes.

Tissue Containing Totipotent Embryonic Stem Cells Is Difficult to Obtain;