Which of the following statements describes events during oogenesis?
A. The primary spermatocyte divides producing two spermatids.
B. The primary oocyte divides producing four diploid cells.
C. The primary oocyte divides producing two haploid cells.
D. The primary oocyte divides producing four haploid cells.
E. None of these events occur during oogenesis.
Answer: C
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What is the key concept addressed by the question?
What will be an ideal response?
New genetic variations sometimes become more common within populations because ____
a. most parts of the genome are non-coding and available for selection b. proteins can be "recruited" for advantageous function c. the resulting proteins are advantageous and selected for by nature d. adaptation occurs rapidly in the few species that have survived through time e. mutations are able to select against genetic variations that had disadvantageous function
The demographic transition is typically seen
a. when a country moves from an industrial phase into a more agricultural phase. b. as developed countries use more resources. c. when agriculture becomes more efficient. d. when epidemics lead to high death rates. e. as a country moves toward a more industrial phase.
In which ways does overfishing lead to decreased biodiversity?
A) overfishing allows fished species to overpopulate once the larger individuals are removed from the population, which in turn depletes the species' food sources B) it depletes fish that feed on some species and serve as food sources for other species, leading to the eradication of some species and the overpopulation of others C) it depletes food sources for aquatic mammals, which then overpopulate D) it reduces the available habitat for other species E) Newer technologies allow the fishing fleet to take a larger catch while leaving large numbers of breeding pairs, which overpopulate and degrade the environment