Fate mapping is currently used to determine the embryonic origin of tissues in an adult. What possible
applications do you see for this procedure in the future?
What will be an ideal response?
At the present time, completed fate mapping has only been entirely accomplished in transparent
organisms such as the nematode mentioned in the text. If fate mapping were completed for all
organisms, we might find powerful embryonic evidence of a shared ancestry. In addition, one can
envision in the future that the treatment for hereditary diseases could possibly begin in an embryonic
stage.
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Which of the following was successfully used to treat a patient with severe combined immunodeficiency (SCID)?
A) Vaccines B) Gene therapy C) Bt toxins D) Growth hormones E) Insulin
The morula stage is part of which phase of embryonic development?
What will be an ideal response?
In humans and in chimpanzees, 99% of the Alu retrotransposons are in corresponding positions. Which of the following statements below is the most likely explanation for this similarity?
(a) The Alu retrotransposon is not capable of transposition in humans. (b) Most of the Alu sequences in the chimpanzee genome underwent duplication and divergence before humans and chimpanzees diverged. (c) The Alu retrotransposons are in the most beneficial position in the genome for primates. (d) The Alu retrotransposons must also be in the same position in flies.
Streptococcus pyogenes causes all of the following infections except ________.
A. necrotizing fasciitis B. scalded skin syndrome C. impetigo D. erysipelas E. scarlet fever