Reproductive isolation in Darwin's finches was studied by Podos. He measured beak size and found a correlation between this and the finches'
A. song.
B. ability to attract certain mates.
C. flight patterns.
D. song and ability to attract certain mates.
E. flight patterns and song.
D. song and ability to attract certain mates.
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XLD agar serves which purpose when used in the bacterial fecal culture?
a. Evaluation of general flora and predomi-nant species b. Selection of enteric pathogens such as Salmonella, Aeromonas, and others c. Inhibition of normal flora and selection of enteric pathogens d. Enrichment for enteric pathogens such as Salmonella and others
While lying awake in bed, you stare at your ceiling, watching a faint sparkling, shimmering movement in the pitch darkness around you. What causes this phenomenon in the absence of visible light?
a. Myopia makes near infrared light perceivable. b. The cosmic microwave background is faintly visible. c. Tonic activity generates illusory visual activity. d. Degeneration of the optic nerve creates false images.
What agricultural practice encourages the rapid spread of plant diseases?
a. irrigation practices b. use of herbicide sprays c. genetic modification of crops d. planting large areas with a single crop variety e. use of pesticides
For codominant alleles, the frequency of the different phenotypes cannot be used to determine the
allele frequencies. Indicate whether the statement is true or false.