Two genes on each of four homologous chromosomes (HC) are described here, but only one of each
pair of sister chromatids is listed (HC1 and HC2). Capital and lower case indicate different alleles of
the same gene. What four gametes will result from a single chiasma if the chromosomes have the
following genes: HC1: ab; HC2: AB?
a. Ab, AB, ab, aB
b. Ab, Ab, aB, aB
c. Aa, Bb, ab, Ab.
d. Ab, Ab, AB, AB
e. AB, AB, ab, ab
A
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Some cells have several nuclei per cell. How could such multinucleated cells be explained?
A) The cell underwent repeated cytokinesis but no mitosis. B) The cell underwent repeated mitosis with simultaneous cytokinesis. C) The cell underwent repeated mitosis, but cytokinesis did not occur. D) The cell had multiple S phases before it entered mitosis.
How can freeze-fracture be used to determine the orientation of a protein in a membrane?
A. Freeze-fracture allows a cell to be cleaved in between the lipid bilayer, splitting the plasma membrane into two layers. B. Freeze-fracture allows a cell to be cleaved in such a way as to preserve the embedded proteins. C. Freeze-fracture cuts the membrane in protein-sized components for viewing under an electron microscope.
The FBI currently determines an individual's DNA profile using:a
DNA sequencing. b. mitochondrial DNA variations. c. RFLPs. d. DNA ligation. e. 13 STR markers.
If you conduct your estimation using two-stage least squares by separately estimating each regression (say in Excel), what condition should you be aware of when interpreting your second stage results?
A. The coefficients will be too high. B. The coefficients will be too low. C. The residuals do not sum to zero as they due in the first stage. D. The standard errors reported in the second stage are not accurate.