How would the phenotypes of progeny differ if a trait was produced from the influence of many genes, compared to a trait caused by a single gene with two alleles and incomplete dominance?
A. They would not differ, and progeny in both
would have an array of phenotypes that vary
continuously across a range.
B. The progeny from the single-gene cross
would all be identical, whereas the manygene
cross would vary continuously across a
spectrum.
C. The progeny from the single-gene cross
would have three phenotypes, whereas the
progeny of the trait caused by many genes
would vary continuously across a spectrum.
C
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a. the cells divide continuously b. they have a benign form and a deadly form c. several mutations in several different genes are required in order for cancer to develop d. they are always due to a chromosome disjunction mutation e. the rapid proliferation of cells is required
Proteins in thermophiles must be stabilized by van der Waals forces, because hydrogen bonds cannot be maintained at
high temperatures
high temperaturesNoting that half of a population is between the ages of 7 and 10 illustrates which of the following?
a. an r-selection graph b. a k-selection graph c. an age structure d. a growth curve
Adam, a once active normal three-year old boy, was experiencing increasing bouts of lethargy and began to regress developmentally. His mother scheduled an appointment with his pediatrician, who ordered a number of different blood tests. The most notable blood test result that piqued the physician's interest was a pronounced eosinophilia. Which of the following would be most likely to cause this abnormality?
A. Infection with Giardia intestinalis B. Infection with a parasitic helminth C. Infection with Cryptosporidium spp.? D. Malaria E. Viral infection