What is the mordant in the Gram stain?
a) Iodine
b) Safranin
c) Alcohol-acetone
d) Crystal violet
Ans: a) Iodine
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A newborn is identified as having cystic fibrosis. While both parents are healthy, a genetic screening of both parents will most likely reveal:
A. the father is a carrier of the mutant CF allele. B. the mother is a carrier of the mutant CF allele. C. both mother and father are carriers of a mutant CF allele. D. neither mother nor father are carriers; spontaneous mutation caused the baby's disease.
An example of a prezygotic isolating mechanism is behavioral isolation
Indicate whether the statement is true or false.
What are the two sets of reactions for photosynthesis?
What will be an ideal response?
Consider a population of crickets in which the A and a alleles at a single locus control the shape of the male and female reproductive organs
Males that are AA can only mate with females that are aa, and vice versa. Heterozygous individuals can mate with either homozygous group. After many generations of selection, the two alleles will reach a ______ equilib-rium due to _______ frequency dependent selection. a. stable, negative b. balanced, negative c. unstable, positive d. stable, directional e. unstable, negative