Suppose that an F1 dihybrid cross results in a phenotypic ratio of 9:3:4. What does this tell you?
a. The second locus is dominant over the first locus.
b. Dominance is incomplete at the second locus.
c. Epistasis is occurring.
d. Codominance is at the second locus.
Ans: c. Epistasis is occurring.
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Which of the following is the most spontaneous reaction? A reaction that is _____
A) slightly exothermic and leads to a slight increase in entropy B) slightly endothermic and leads to a huge decrease in entropy C) highly exothermic and leads to a huge decrease in entropy D) slightly exothermic and leads to a huge increase in entropy
A researcher wants to clone a specific gene of interest. Why would he/she choose a viral vector for introducing the gene of interest into a host cell?
A. A viral vector contains its own metabolic machinery and does not affect the host cell. B. A viral vector can infect living cells and take control of the host cell's metabolic machinery. C. A viral vector is nonliving. D. A viral vector contains circular DNA, thus it is easier to insert the gene of interest. E. None of the choices are correct.
Nearly all ecosystems receive a constant input of energy from ____
a. bacteria b. biomass c. nutrients d. plants e. the sun
What is a merozygote?
What will be an ideal response?