When Mendel crossed pure breeding peas having yellow seed color (YY) with pure breeding peas having green seed color (yy), all of the offspring had yellow seed color. These results mean that yellow seed color is the
A) genotype.
B) dominant phenotype.
C) mode of inheritance.
D) recessive phenotype.
B) dominant phenotype.
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What happens to a retinal photopigment when it captures a photon?
A. It releases an electron. B. It fluoresces. C. It changes shape. D. It begins to vibrate. E. It does nothing.
Which of the following describes a cnidocyte?
a. stinging cell b. outer layer of cells c. reproductive structure d. digestive cell
Changes in tool-kit gene expression (i.e. Hox genes) has been important in what events?
A. The diversification of body plans in arthropods. B. The development of the vertebrate jaw. C. The diversification of mollusk body plans. D. All of the above.
Considering that leaf stoma have the conflicting functions of allowing gaseous carbon dioxide into the leaf, yet preserving the plant's supply of water, which of the following is (are) reasonable?
A. Corn, oats, rice, and wheat-all monocots-have relative upright blades with sunlight hitting both sides and would have stoma distributed evenly on both sides. B. Tree leaves that orient flat and present the top side to the sun would have most of their stoma on the bottom of the leaf. C. A submerged-water plant would have no stoma. D. All of the choices are reasonable. E. None of the choices are reasonable, since stoma are found uniformly on all type of leaves.