If the four cells shown resulted from cell division of a single cell with diploid chromosome number 2n = 4, what best describes what just occurred?
A) normal meiosis
B) translocation
C) inversion
D) nondisjunction
Answer: D
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When Mendel crossed purple-flowered pea plants with white-flowered pea plants, he never got offspring with flowers that had an intermediate color. This was counter to the theory of
A. independent assortment. B. blending inheritance. C. direct transmission of traits. D. segregation of alleles. E. continuous variation of traits.
Four of the five answers listed below are characteristic of meiosis. Select the exception
a. involves two divisions b. reduces the number of chromosomes c. results in producing genetically identical cells d. produces haploid cells e. occurs in the gonads
For circulating antibodies to reach the foreign cells in connective tissue, as an example in a puncture wound, what must happen?
a. Histamines must cause capillary permeability to decrease. b. Histones must cause interferons to be produced. c. Interferons must activate b cells. d. Antihistamines must deactivate goblet cells. e. Histamines must increase capillary permeability.
Which of the following statements is NOT
true?
a. All isotopes of an element have the same number of electrons. b. All isotopes of an element have the same number of protons. c. All isotopes of an element have the same number of neutrons. d. All radioisotopes are unstable. e. All isotopes of an element have the same atomic number.