In Drosophila melanogaster there is a sex-linked gene for eye color that is found only on the X
chromosome. The allele for red eye color (Xw+) is dominant over the allele for white eye color (Xw).
You examine a vial of 100 flies that are all offspring from a single genetic cross. You find both redeyed
females and white-eyed females as well as both red-eyed males and white-eyed males. The
genotypes of the parents were
a. Xw+Xw+; XwY.
b. Xw+Xw; XwY.
c. XwXw; Xw+Y.
d. Xw+Xw; Xw+Y.
e. XwXw; XwY.
B
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Which of the following is a major risk factor for developing diabetes?
a. geographic location b. obesity c. gender d. exposure to excessive sunlight e. vegetarian diet
Which choice best describes the main idea behind using the lod method to determine if genes are linked?
1.Linked genes that are farther apart are more likely to be separated by crossing over, so genetic map units are derived from recombination frequencies. 2.The lod score is the log10 of the ratio of the two probabilities that results are either consistent with linkage or that they are not. 3.Software is used to calculate the probability, or lod score, that the observed frequency of recombination is consistent with linkage. 4.One lod map unit is equal to a 10% frequency of recombination.
One of the major symptoms of Marfan syndrome is
a. hypertension. b. rupture of the aorta. c. retardation. d. short stature. e. abnormally short arms and legs.
The stacking of thylakoid membranes into grana decreases the surface area for photosynthesis.
a. true b. false