You perform a test cross of the dihybrid AaBb and score the phenotypes of 1000 progeny. Assuming independent assortment, how many of the progeny do you expect to display the dominant phenotype for both the A and B genes?
A) 100
B) 200
C) 250
D) 500
E) 750
C
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How many bases are necessary to complete three complete twists (1080 degrees) of a DNA helix?
A. 5 B. 10 C. 30 D. 60
Mendel's work on the transmission of genes in pea plants is applicable to ____
A. only pea plants B. plants and some animals but not humans C. all plants, but only plants D. all plants and animals, including humans E. all organisms
Which of the following correctly describes a reaction that has reached chemical equilibrium?
A) The rate of the forward reaction is equal to the rate of the reverse reaction. B) All of the reactants have been converted to the products of the reaction. C) All of the products have been converted to the reactants of the reaction. D) Both the forward and the reverse reactions have stopped, with no net effect on the concentration of the reactants and the products.
A monophyletic group has how many common ancestors?
A. One B. Two C. Three D. Many E. It is variable