A woman comes to your genetic counseling center because she knows that Huntington disease occurs in members of her family. Her paternal grandfather was afflicted, but so far her father shows no symptoms. Her two great-great grandmothers on her father's side were healthy well into their 90s, and one of her great-great grandfathers died of unknown causes at 45. Testing for Huntington disease is
extremely expensive, but she is concerned that she may fall victim to this disease and wants to plan her life accordingly. After examining her pedigree you advise her to
A. not get tested because there is no possibility that she is homozygous.
B. not get tested because only males in her family get the disease.
C. get tested because her father could be a carrier.
D. not get tested because her father is only a carrier and it is very unlikely her mother is a carrier.
E. not get tested because her 40-year-old father shows no symptoms.
C. get tested because her father could be a carrier.
You might also like to view...
You extract DNA from an E. coli cell and observe it is hemi-methylated. Which strand of DNA is older?
A. The methylated strand B. The strand that is not methylated C. Neither—they are the same "age."
Some scientists believe that RNA was the first information storage molecule because ____
a. some viruses use RNA as their information storage molecule b. RNA can be an enzymatic catalyst as well as an information storage molecule c. amino acids cannot form peptide bonds without ribosomes to catalyze their formation d. RNA is a less stable molecule than DNA e. proteins are made of far more amino acid monomers (over 20) than RNA (4)
The hairpin design of the loop of Henle allows events on one side of the loop to influence the events on the other side, by a process referred to as
A) paratubular movement. B) countercurrent exchange. C) bulk flow. D) glomerular filtration. E) tubular reabsorption.
Which of the following would be most affected by a mutation that prevented cells from forming tight junctions?
A) attachment of cells to the surrounding matrix B) direct flow of water and small molecules from one cell to another C) integrity of the inner lining of the digestive tract D) attachment of the cytoskeleton to the inside of the plasma membrane