What is n in tetraploid oysters?
A) 5
B) 10
C) 20
D) 40
C) 20
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Using the great lubber grasshopper as a model, Walter Sutton observed:
A. separation of maternal and paternal chromosomes during mitosis. B. replication of chromosomes during meiosis. C. crossing over of homologous chromosomes. D. pairing of homologous chromosomes during mitosis. E. pairing of homologous chromosomes during meiosis.
Which wavelength of light is the shortest?
A. X-rays B. infrared C. UV light D. visible light E. gamma rays
A plant breeder is attempting to breed a variety of corn with high oil content. Each generation, he crosses only those plants that have the highest oil content. Over time, the average oil content of his plants increases. He does this with two strains of plants. For Strain A, h2 = 0.3. For Strain B, h2 = 0.6. Which strain will more quickly increase in oil content with selection?
a. Strain A b. Strain B c. Strain C d. No difference
Type S Streptococcus pneumoniae bacterium is lethal and will kill its host. If heat inactivated the S strain dies and becomes nonlethal. Type R Streptococcus pneumoniae is a nonvirulent strain of bacteria. What would occur if one were to inject both the R strain and heat-killed S strains into a host organism such as the mouse?
A. The R strain would be transformed into the virulent S strain and kill the host. B. The R strain would be transformed into the virulent S strain and not affect the host. C. The S strain would be transformed into the nonvirulent R strain and kill the host. D. The S strain would be transformed into the nonvirulent R strain and not affect the host. E. Neither the S nor the R strain would change.