What aspect of chromosome behavior most clearly accounts for Mendel's law of independent assortment?
A) movement of sister chromatids to opposite poles at anaphase II of meiosis
B) movement of homologous chromosomes to opposite poles at anaphase I of meiosis
C) crossing over between homologous chromosomes during prophase I of meiosis
D) replication of chromosomes prior to meiosis
E) independent alignment of different homologous pairs on the metaphase I spindle
E) independent alignment of different homologous pairs on the metaphase I spindle
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Which of the following are incorrectly matched for a single-factor cross?
A. P generation / true breeding B. F1 generation / monohybrid C. F2 generation / result of F1 cross D. F1 generation / result of P cross E. F2 generation / result of P cross
When a cell undergoes mitosis,
a. the daughter cells have identical genes. b. the daughter cell has genes identical to those of the mother cell that produced it. c. the amount of cytoplasm in the mother cell and in each of the daughter cells is equal. d. there is an exact duplication and division of all of the organelles between daughter cells. e. the daughter cells have identical genes, and the daughter cell has genes identical to those of the mother cell that produced it.
Individual B cells produce
A) several different types of antibodies. B) the antibodies specified by its constant region gene. C) their own unique antibody. D) an infinite diversity of antibodies.
Which of the following is not one of the stages of HIV infection?
A. flat or raised lesions on the penis or vulva B. opportunistic infections C. a CD4 + T cell count between 200 and 499 per microliter of blood D. a greater than 500 CD4 + T cells per microliter of blood E. a CD4 + T cell count below 200 per microliter of blood