A certain species of land snail exists as either a cream color or a solid brown color. Intermediate individuals are relatively rare. Which of the following terms best describes this?
A) artificial selection
B) directional selection
C) stabilizing selection
D) disruptive selection
E) sexual selection
Ans: D) disruptive selection
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Which one of the following statements about diplomonads and parabasilids is false?
A. Absence of mitochondria in these groups is an ancestral trait. B. Some members are parasitic, but some also engage in mutualism. C. Diplomonads and parabasilids belong to different clades D. Both groups are flagellated protists.
Amniocentesis involves sampling
a. the fetus directly. b. the fetal cells floating in the amniotic fluid. c. sperm. d. blood cells. e. placental cells.
A DNA codon reads GCC. Give the corresponding mRNA codon, tRNA anticodon, and amino acid
What will be an ideal response?
To use the normal distribution to calculate the p-value of a hypothesis test involving the population mean, which assumption is not necessary?
A. The null hypothesis is zero. B. The sample is random. C. The sample is "large" enough (e.g., larger than 30). D. None of the answers is correct.