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Terms in this set (7)
Any relatively unspecialized cell that can reproduce itself both indefinitely and under appropriate conditions, differentiate into specialized cells of one or more types
totipotent stem cell
any cell with potential of mature cells being able to dedifferentiate and then give rise to all specialized cell types of the organism
pluripotent stem cell
capable of differentiating into many different cell types
contrast the different processes used to clone plantts and animals
many older plants are still able to differentiate or specialize whereas animal cells lose this ability so cloning plants is easier than cloning animals
uniqueness's of stem cells
they divide and renew themselves for a long period of time
remain undifferentiated in form
can differentiate into a variety of specialized cell types
If you clone a carrot, will as the progeny plants ("clones") look identical? Why or why not?
No, primarily because of subtle (and perhaps not so subtle) differences in their environments
ased on current knowledge, how would you explain the difference in the percentage of tadpoles that developed from the two kinds of donor nuclei in figure 20.17?
The state of chromatin modification in the nucleus from the intestinal cell was undoubtedly less similar to that of a nucleus from a fertilized egg, explaining why many fewer of these nuclei were able to be reprogrammed. In contrast, the chromatin in a nucleus from a cell at the four-cell stage would have been much more like that of a nucleus in a fertilized egg and therefore much more easily programmed to direct development.
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