Why is meiosis necessary for sexual reproduction?
What will be an ideal response?
If the chromosome number were not reduced from the diploid to the haploid number before gametes are produced, each succeeding generation would have twice the number of chromosomes as the generation before.
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Most antibiotics act by disrupting the ribosomes in bacterial protein synthesis. Why do antibiotics not disrupt the human patient’s protein synthesis as well?
a. The DNA in bacteria is highly specialized so the drugs only work on their DNA. b. Prokaryotes and eukaryotes go through different stages except elongation. c. Prokaryotic and eukaryotic ribosomes are very different from each other. d. Antibiotics do disrupt human protein synthesis, which is why we only take very low dosages.
Which statement is least consistent with the beliefs of Lamarck?
a. “Fluida” moves into areas of the body in need of change. b. Acquired characteristics are inherited. c. Giraffes' necks have become longer in response to stretching. d. Environmental pressures bring about changes in organisms. e. Changes in an individual are not passed to its offspring.
A condition in which one gene pair masks the expression of a nonallelic gene pair is called ________
A) dominance B) additive alleles C) codominance D) epistasis E) recessiveness
Biologists usually classify things according to their:
a. appearance b. habitat c. when they lived