Assume that having three nostrils is inherited as a sex-linked trait on the Y chromosome. A man with three nostrils has a daughter who has a son with a man who has only two nostrils
What is the probability that the three-nostriled man's grandson has three nostrils? A) 0%
B) 25%
C) 50%
D) 100%
A
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What would be the result for a patient if all his spermatogonia went through meiosis and proceeded to develop into spermatids?
A. He would produce twice as many sperm and would be protected against infertility from other causes. B. He would produce twice as many sperm, which would crowd them during later development and lead to morphological defects. C. He would be entirely normal, since this is what usually happens. D. After one round of sperm production he would no longer be able to produce sperm and would be infertile.
Mutations in a normal growth-stimulating gene are most likely to have no effect or to cause
A) the loss of responsiveness to growth stimulation in the cell with the mutant gene. B) the cell with the mutant gene to become cancerous. C) excessive growth in the cells surrounding the one with the mutant gene. D) a mutator effect in the cell with the mutant gene. E) apoptosis of the cell with the mutant gene.
The accommodation of the very long DNA strands that are part of a chromosome into the limited space of the nucleus is achieved by coiling the DNA around beads of histones into repeating subunits. These DNA-wrapped histones are called:
A. Solenoids B. Chromatin loops C. Rosettes D. Nucleosomes
Why do cells need buffering agents?
a. to operate at a constant pH of 2.0 b. to help transfer electrons from one atom to another c. to minimize the changes in pH of their internal environment d. to increase the amount of OH- in their surroundings