Before stem cell research was such a prominent topic in the news, many people were misinformed about embryonic stem cell research
Many people thought that this form of stem cell research could be completed only by collecting stem cells from electively aborted fetuses. Explain specifically where embryonic stem cells come from when used for research and why these cells would not typically be found in aborted fetuses.
Embryonic stem cells are harvested from embryos that are made up of only 20 to 30 cells and are only a few days old. Because a female would not know she is pregnant at this time, it would be impossible to collect these cells from the embryo of a natural fertilization. For these cells to be collected, in vitro fertilization using donor egg and sperm must occur to create the embryos from which the stem cells will be harvested a few days later.
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In the experiment outlined in the figure above, what would you expect to happen if researchers supplied an enzyme that blocked the expression of the Dll gene?
A) The embryo would have appendages in abnormal locations. B) The origins of the embryo's appendages would fluoresce. C) The developing embryo would have no appendages. D) The embryo's appendages would be shorter than usual.
The female erectile structure analogous to the male penis is the ____
a. labia majora b. labia minora c. mons pubis d. cervix e. clitoris
Perchlorate contamination of waterways causes which of the following problems in frogs?
a. male frogs with both male and female sex organs b. excessive growth c. interference with the metabolism of iodine d. low blood calcium and slowed bone formation
Which body plan is found in the chordates?
1.Acoelomate body plan
2.Coelomate body plan
3.Pseudocoelomate