Albinism is an autosomal (not sex-linked) recessive trait. A man and woman are both of normal pigmentation, but both have one parent who is albino (without melanin pigmentation). What is the probability that their first child will be an albino?
A) 0
B) 1/2
C) 1/4
D) 1
C
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Summarize the results of one of the first investigations of the genetics of skin color
What will be an ideal response?
Mike has just returned home from college for the summer and notices that his 8-year-old Dalmatian dog Patches is limping and has difficulty walking up and down stairs. When Mike takes Patches to the vet, the vet recommends that Mike put him on a low-purine diet. This dietary change will lessen the formation of painful precipitates of ________ in Patches' joints.
A. adenine and guanine B. urea C. ammonia D. NaCl E. uric acid
Which of the following is not a reason why healthcare epidemiology is essential to quality care?
A) Healthcare-acquired infection incidence increased by almost 40 percent from 1975 to 1995. B) Hospitals have been inadvertent sources of infection for thousands of years. C) About 75,000 people die from healthcare-acquired infections every year. D) Healthcare staff are dedicated to helping patients heal. E) Healthcare-acquired infections add an extra $35 billion dollars per year to U.S. healthcare costs.
You are interested in understanding how the brain works, and are using the fruit fly Drosophila as a model system to study brain development. You perform a microarray analysis to try to determine genes expressed in the fly brain
For your microarray experiment, you first prepare cDNA from fly brains and label it with a red fluorochrome. Then you isolate cDNA from whole flies and label it with a green fluorochrome. Next you hybridize these cDNA populations to a microarray containing the Drosophila genes. From this you obtain a list of genes that are specifically enriched in the brain (those that show up as a red spot on the microarray). You are disappointed because your favorite fly gene, tubby, does not appear on this list, even though you have repeated the microarray experiment 10 times and did not encounter any technical difficulties. The reason you thought tubby would appear on this list is that you believe tubby is important for brain development, because flies mutant in tubby have no brains. Not to be discouraged, you perform in situ analysis using the tubby DNA as a probe, and see that it is expressed at high levels in the fly brain of normal flies but not expressed in animals lacking the tubby gene. Why do you think tubby did not show up as a gene specifically enriched in the brain in your microarray experiment?