The 14C:12C ratio can be used to date fossils that are up to approximately how old?
A) 100 million years
B) 7 million years
C) 75,000 years
D) 7,500 years
Answer: C
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What might be the outcome of repeated duplications of one or a few genes in a species' genome?
A) tetraploidy B) semisterility C) the presence of gene families D) repetitive DNA that is of no use to the cell E) fusion of segments of two chromosomes into one
Speciation caused by a change in the course of a river is an example of ____ speciation
a. divergent b. parapatric c. allopatric d. convergent e. sympatric
The B-I mutation in anthocyanin (red pigments) produces pigmented corn plants, whereas the B mutation in the same gene usually produces nearly unpigmented corn plants when homozygous (B´/B´). When homozygous B-I and B plants are intercrossed, the F1 plants are essentially unpigmented, like the B homozygotes. If this outcome were due simply to the dominance of B to B-I, then a self-cross of the F1 plants (B´/B-I) should generate B-Icolored homozygotes as approximately 1/4 (B-I/B-I) of the F2 progeny. Instead, no F2 are pigmented. Intercrosses of the F2 and of further generations do not restore the pigmented phenotype. What is the term for this type of inheritance?
A) Mendelian inheritance B) organelle genome inheritance C) allelic inheritance D) epigenetic inheritance
Which agency is responsible for regulating disinfectants?
A) Environmental Protection Agency B) National Institutes of Health C) Food and Drug Administration D) World Health Organization