Assume that a dihybrid F2 ratio, resulting from epistasis, was 9:3:4. If a double heterozygote is crossed with the fully recessive type, what phenotypic ratio is expected among the offspring?
What will be an ideal response?
1:1:2
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A deleterious mutation in recA results in
A) a decrease in specific recombination. B) a decrease in homologous recombination. C) an increase in homologous recombination. D) no change in either general or specific recombination.
Proteins known as ________ function to refold partially denatured proteins
A) histones B) chaperonins C) HU proteins D) histones and chaperonins
The fossil record indicates that the first vascular plants possessed roots
A. true B. false
Letter “A” designates the ____, which provided for a more reliable food supply approximately 11,000 years ago
a. Bubonic plague b. domestication of plants and animals c. industrial and scientific revolutions d. discovery of America e. emergence of agriculturally based urban societies