The biological species concept is favored by systematists because when reproductive isolation evolves, there is a barrier to gene flow that allows for the isolated groups to generate their own unique divergent traits.
a. true
b. false
Answer: a. true
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Which of the following statements best describes our understanding of the role of condensins during cell division?
A. Condensins form rosettes of supercoiled DNA. B. Condensins form solenoid shaped supercoiled DNA. C. Using ATP, condensins form rosettes of supercoiled DNA. D. Using ATP, condensins form solenoid-shaped supercoiled DNA. E. In association with topoisomerase I, condensins stabilize nicked DNA.
A graphic tool used to determine the probable outcome of genetic crosses is the
a. Mendelian box. b. Archimedian triangle. c. Euclid box. d. Hardy-Weinberg graph. e. Punnett square.
A gene exists as two alleles in a population of freely mating individuals. If 40% of the population carries the recessive allele (a) for the gene, what percentage of the population has the homozygous recessive aa genotype?
A) 40% B) 20% C) 16% D) 80%
What makes neonatal herpes a very serious condition?
A) The potential for life-long infection. B) Central nervous system infection of the neonate. C) HHV infection of the bone marrow. D) Development of lymphoma. E) The potential for oncogenesis.