In recessive lethal diseases such as Tay-Sachs disease, carriers have one copy of the normal allele and one copy of the allele for the disease. Carriers are represented in the Hardy-Weinberg formula by ________.
A. 2pq
B. 1 - q
C. the Hardy-Weinberg equilibrium
D. the frequency of homozygous dominants plus frequency of heterzygotes plus the frequency of homozygous recessives
A. 2pq
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This organism, belonging to the family Enterobacteriaceae, grows best at 25°C to 30°C. Domestic and wild rats and other animals can carry this organism. What is the medium of choice?
a. MacConkey agar b. Xylose-lysine-deoxycholate (XLD) agar c. Cefsulodin-irgasan-novobiocin (CIN) agar d. Hektoen enteric (HE) agar
In basidiomycetes the _______ is diploid.
A. basidium B. primary mycelium C. secondary mycelium D. zygote
The organ that is responsible for secreting cocoons in the oligochaetes is known as the
A. nephridia. B. setae. C. radula. D. clitellum. E. lophophore.
The difference between MDR-TB and XDR-TB is that
A. MDR-TB exhibits resistance to isoniazid and rifampin whereas XDR-TB strains are resistant to bedaquiline. B. XDR-TB is predominantly seen in the USA whereas MDR-TB is common in India and China. C. MDR-TB strains are classified as having resistance to two antibiotics, whereas XDR-TB strains are classified when they are resistant to four antibiotics. D. MDR-TB strains have a higher mortality rate than XDR-TB strains.