Where does crossing over occur?
A) at the centromeres
B) at the telomeres
C) at nodules that occur randomly at "hotspots" along the synaptonemal complex
D) at nodules that occur in specific, evenly spaced locations along a chromosome
E) at both the centromeres and telomeres
C
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Tumor cells arise from normal body cells after a series of cellular “mistakes” disrupts the controls over, and processes of, mitosis and cytokinesis. Describe two errors that might happen during the processes of mitosis and/or cytokinesis and that would produce a daughter cell with “extra” chromosomes.
What will be an ideal response?
Infertility affects around one in ________ males.
A) 10 B) 25 C) 50 D) 100
Polyploidy may arise from the failure of chromosomes to separate during cell division or by the
fertilization of an egg by more than one sperm. _________________ Indicate whether the statement is true or false.
You are doing research on rodent populations in a cornfield at night and are hearing popping noises. Your research assistant is getting scared. Having taken biology, you can explain to your assistant that the popping sound is due to
A. the developing of the kernels of corn on the ears of the corn stalks. B. the growth of the intercalary meristems inside the corn stalk. C. the expansion of the lateral meristems increasing the girth of the corn stalk. D. the apical meristem cells in the corn stalks elongating. E. the development of the tassels on top of the corn stalk.