Contrast the mechanisms of dosage compensation in humans with those found in insects like Drosophila
What will be an ideal response?
The mechanisms of dosage compensation found in humans and fruit flies represent two different solutions to the same problem. In both cases, X-linked genes are present in twice the copy number in XX females as in XY or XO males, potentially creating a dosage imbalance. In mammals like humans, this is solved through X-inactivation, while in insects like Drosophila it is solved through X-hyperactivation. Both act to restore X-expression parity between females and males.
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Which layer of the digestive tract has secretory and absorptive functions?
A. lumen B. mucosa C. submucosa D. longitudinal muscles E. serosa
The hormone ________, produced by ________ cells of the pancreas, will quickly lower the level of glucose in blood
a. insulin / beta b. glucagon / beta c. insulin / alpha d. glucagon / alpha
The end products of glycolysis include
A) NADH. B) acetyl CoA. C) citric acid. D) O2.
Failure of thymus development may result in
A) type I diabetes. B) Grave's disease. C) Bruton-type agammaglobulinemia. D) DiGeorge syndrome. E) chronic granulomatous disease.