Speciation by polyploidy, which is common in plants, can cause a new species to form in one generation. This is because.
A. The doubling of chromosomes leads to embryo death
B. The increased number of chromosomes allows them to produce more offspring
C. The reduction of chromosomes means they are smaller and can disperse more easily
D. The new individuals with increased chromosomes can no longer produce viable offspring with the parent populations
Ans: D. The new individuals with increased chromosomes can no longer produce viable offspring with the parent populations
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In prokaryotes, the genes for metabolic pathways are ____
a. always expressed for early steps in the pathway, but generally not expressed for later steps in the pathway b. always expressed so the bacteria can respond to rapidly to changing conditions c. turned on and off as conditions change d. always independently regulated e. generally expressed at low levels, but expressed at high levels when conditions warrant
A transport system in which transport of an ion in one direction provides the energy for active
transport in the opposite direction is known as ____.
a. antiport b. active diffusion c. symport d. cotransport e. osmosis
In a population with brown and green alleles for color, genetic drift
A. occurs when individuals move into or out of a population, changing the allele frequencies in the population. B. has more effect on the evolution of a large population. C. always increases the frequency of brown alleles in the population. D. causes populations to become better adapted to their environments. E. has more effect on the evolution of a small population.
What part of a tooth often thins from years of brushing, teeth grinding, and eating acidic foods?