Normal biota of the respiratory tract
A. only include Staphylococcus aureus.
B. can cause disease in immunocompromised patients.
C. are only comprised of staphylococcal species.
D. are localized to the nasopharynx only.
E. do not include yeasts or viruses.
Answer: B
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Genetic disorders such as Tay-Sachs disease, Bloom syndrome, Gaucher disease, and Canavan disease are more common in Ashkenazi Jewish populations because
A) spontaneous mutations occur more frequently in this group. B) the gene pool has been highly variable over thousands of years. C) microevolution has not influenced this culture. D) their history includes several population bottlenecks.
If a couple is planning on having three children, what is the probability that only one will be male?
a. 0 b. 1/4 c. 3/8 d. 1/2 e. 3/4
For a particular gene, the frequency of the dominant allele H is 0.65. The total population size is
10,000 individuals. Also, the homozygous recessive condition results in living but sterile offspring. Fill in the table of values for the generations indicated:Generation p q p2 2pq q2 1 2 Does this population exhibit Hardy-Weinberg equilibrium? Why or why not? If not, what assumptions does the Hardy-Weinberg principle make that appear to be inapplicable in this situation? What will be an ideal response?
Characterized by permafrost and low, shrubby plants, ________ can be found nearest the poles.
A. chaparral B. tundra C. temperate deciduous forests D. taiga