A variable trait in corn is the presence or absence of knobs at particular sites on some chromosomes. The allele present on each chromosome determines whether or not that chromosome has a knob. Suppose that one member of each of two pairs of homologs in a corn plant has a knob. If this plant is crossed with a knobless plant, what percentage of the offspring is expected to have only knobless chromosomes?
A) 100%
B) 75%
C) 50%
D) 25%
E) 0%
D) 25%
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For mechanisms of sex determination, which of the following is incorrectly paired?
A. X-Y, cow B. X-O, grasshopper C. ZZ-ZW, bluebird D. 1n-2n, pea plant E. high temperature-low temperature, alligator
Two cells with different cell-surface markers are fused in the presence of polyethylene glycol (PEG). The cells are then placed at 0°C. What do you expect to observe about the individual cell markers?
A) The markers will evenly disperse throughout both membranes. B) Only one marker will disperse, while the other remains stationary. C) Both sets of markers will not mix but will migrate to opposite poles from one another. D) The markers will essentially remain where they are, with little migration. E) The markers will be endocytosed by the fused cell and then redistributed as fused markers.
If two atoms belong to the same element, which of the following must be true
a. They have the same number of ions. b. They have the same number of neutrons. c. They have the same number of electrons. d. They have the same number of protons.
Moss sperm are produced in
A. antheridia. B. stomata. C. sporophytes. D. lycophylls. E. archegonia.