The meiotic cell cycle involves two cell divisions but only one DNA replication
Indicate whether the statement is true or false
TRUE
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Why should deepwater shrimp on different sides of the isthmus have diverged from each other earlier than shallow-water shrimp?
A) They have been geographically isolated from each other for a longer time. B) Cold temperatures, associated with deep water, have accelerated the mutation rate, resulting in faster divergence in deepwater shrimp. C) The rise of the land bridge was accompanied by much volcanic activity. Volcanic ash contains heavy metals, which are known mutagens. Ash fall caused high levels of heavy metals in the ocean sediments underlying the deep water, resulting in accelerated mutation rates and faster divergence in deepwater shrimp. D) Fresh water entering the ocean from the canal is both less dense and cloudier than seawater. The cloudy fresh water interferes with the ability of shallow-water shrimp to locate mating partners, which reduces the frequency of mating, thereby slowing the introduction of genetic variation.
Consider the links in the chain of infection. Which of the links is broken when hands are thoroughly washed?
A. Virulence B. Exposure C. Dose D. The agent E. Susceptibility
Crossing over is one of the most important events in meiosis because
a. it produces new combinations of alleles on chromosomes. b. homologous chromosomes must be separated into different daughter cells. c. the number of chromosomes allotted to each daughter cell must be halved. d. homologous chromatids must be separated into different daughter cells. e. the number of chromosomes allotted to each daughter cell must be split in fourths.
The prokaryote operon model explains gene
regulation at the level of a. replication. b. transcription. c. transcript processing. d. transcript transport. e. translation.