In the 1980s, when researchers began seeking gene variants that caused or contributed to bipolar disorder, it seemed that each extended family had its own mutations. These findings, looking back, most likely mean that
A) bipolar disorder results from imitating the behavior of an affected family member.
B) many gene variant combinations cause or contribute to bipolar disorder, but only a few such variants are seen in any one family.
C) many people fake the symptoms of bipolar disorder.
D) bipolar disorder reflects changes in gene expression, but not in mutations.
B) many gene variant combinations cause or contribute to bipolar disorder, but only a few such variants are seen in any one family.
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You have performed the following mating experiment using Hfr and F- strains of Escherichia coli: Hfr (thr+ leu+ gal+ strs) à— F- (thr- leu- gal- strr). Which of the following selective media would you use to score recombinant colonies?
A) minimal medium B) minimal medium + streptomycin C) minimal medium + threonine D) minimal medium + streptomycin + threonine
Meiosis is different from mitosis in that meiosis
A. results in four haploid daughter cells that are genetically identical, whereas mitosis results in two diploid daughter cells that are genetically diverse. B. results in two diploid daughter cells that are genetically diverse, whereas mitosis results in four haploid daughter cells that are genetically identical. C. results in two diploid daughter cells that are genetically identical, whereas mitosis results in four haploid daughter cells that are genetically diverse. D. results in four haploid daughter cells that are genetically diverse, whereas mitosis results in two diploid daughter cells that are genetically identical.
What is the main reason that mammals underwent adaptive radiation after the demise of the dinosaurs?
A. The mammals had little competition so it was easier for them to evolve into the niches that were once occupied by the dinosaurs. B. They had an "inner need" to become better suited to their environment. C. They had to adapt in order to physically survive the ice age. D. No answer choice is correct.
Human asymptomatic carriers are common in
A) Balantidiasis B) Amebiasis and trichomoniasis C) Elephantiasis D) Cryptosporidiosis and malaria E) Trypanosomias