Imagine meiosis in a diploid organism that only has a single chromosome. Like most diploid organisms, it received one copy of this chromosome from each of its parents and the two homologs are genetically distinct
If only a single homologous recombination event occurs during meiosis, which of the following choices below correctly describes the four gametes formed.
(a) None of the gametes will contain chromosomes identical to the chromosomes found in the original diploid cell.
(b) All four of the gametes will have chromosomes identical to the chromosomes found in the original diploid cell.
(c) Three of the gametes will have chromosomes identical to the chromosomes found in the original diploid cell, while one of the gametes will have chromosomes that are different.
(d) Two of the gametes will have chromosomes identical to the chromosomes found in the original diploid cell, while two of the gametes will have chromosomes that are different.
(d) A single recombination event will lead to an exchange of genetic information between two of the chromatids—one from each parent (for example, see Figure 19–7).
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Which of the experiments below would provide the best data set with which to test the hypothesis that female chimpanzees have a greater influence on the vertical transmission of culture than males?
A. Measure the amount of time that young chimps spend with each of their parents, and measure the rate at which they acquire cultural traits. B. Measure the amount of time young chimps spend with their mother only, and measure the rate at which they acquire cultural traits. C. Measure the amount of time young chimps spend with their father only, and measure the rate at which they acquire cultural traits. D. Train a wild chimp to use a new food source, and document how quickly this knowledge spreads to the rest of the population. E. Introduce a new food source to a population and see which chimps learn how to use it first.
Mutations that result in the death of an organism when expressed are called ________ mutations.
A. conditional B. recessive C. dominant D. lethal
Mycobacterium leprae is typically found infecting the ears, toes, and fingers of its host due to its
A. requirement for well-oxygenated blood. B. easy access to those parts. C. need for cooler temperatures. D. long incubation period.
An antigen is?
A) a molecule recognized as being foreign to the body B) a molecule that protects cells from viral infection C) an antibacterial protein D) a protein that joining together to form a membrane attack complex