In Drosophila melanogaster, the gene for eye color is located 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 only red-eyed females and red-eyed males present. Flies from the vial were allowed to
interbreed, and in the next generation you find only red-eyed females, but you find both red-eyed and white-eyed males.
The genotypes of the original parents were ____.
a. Xw+Xw+; XwY
b. Xw+Xw; XwY
c. XwXw; Xw+Y
d. Xw+Xw; Xw+Y
e. XwXw; XwY
ANSWER: a
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Most euryarchaea, except the class Archaeoglobi and the order Archaeoglobales, reduce sulfur during anaerobic respiration by using sulfate as a terminal electron acceptor.
Answer the following statement true (T) or false (F)
DNA probes are used to:
A. determine the nucleotide sequences of DNA samples. B. perform PCR on small samples of DNA. C. cut large segments of DNA into smaller fragments for analysis. D. determine whether a particular DNA sequence is present in a sample. E. determine the degree of similarity between two DNA samples.
Four of the five processes listed below will disrupt Hardy-Weinberg equilibrium. Select the exception
a. non-random mating b. natural selection c. migration d. punctuated equilibrium e. genetic drift
Why is oxygen toxic to strict anaerobes?
What will be an ideal response?