The probability of producing a normal child by
two parents who are carriers for an autosomal
recessive disorder is
a. 50 percent.
b. 0 percent.
c. 100 percent.
d. 25 percent.
e. 75 percent
E
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The tendency of a molecule to have positive and negative regions
A) Polarity B) Compound C) Denaturation D) Monosaccharides E) Hydrogen bonds F) Element G) Triglycerides H) Amino acids I) Tertiary structure J) Active site
Lake Victoria is famous for its variety of cichlid fishes. In fact, they offer the most diverse assembly of vertebrates presently known to science. One trait that scientists have focused on as one possible reason for their adaptability is
A. a second set of scales that lie beneath the top outermost scales. B. a second set of jaws in their throats. C. gill arches that are not covered by an operculum, which prevents hiding places for gill parasites. D. digestive tracts that are able to process most substrates, which has eliminated the need for feeding specialization. E. ability to change color in relationship to their environment.
Which of the following statements characterize heterospory?
_____ It involves production of two different types of spores from a single sporangium. _____ It involves production of two different kinds of spores, one growing into male gametophytes and the other into female gametophytes. _____ It increases the chance of cross-fertilization. _____ It increases the potential for genetic variation and aids evolutionary flexibility. _____ It occurs in seed plants and seedless vascular plants.
What is the primary function of the post-anal tail in aquatic vertebrates?
a. balance b. courting c. locomotion d. communication