A scientist discovers a DNA-based test for the allele of a particular gene. This and only this allele, if homozygous, produces an effect that results in death at or about the time of birth. Of the following, which is the best use of this discovery?
A) To screen all newborns of an at-risk population
B) To design a test for identifying heterozygous carriers of the allele
C) To introduce a normal allele into deficient newborns
D) To follow the segregation of the allele during meiosis
E) To test school-age children for the disorder
Ans: B) To design a test for identifying heterozygous carriers of the allele
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When nonrandom mating occurs in a population so that individuals prefer to mate with similar individuals, allele frequencies should
A) Remain the same, but homozygotes will be overrepresented in the population. B) Remain the same, but heterozygotes will be overrepresented in the population. C) Change and heterozygotes will be overrepresented in the population. D) Change and homozygotes will be overrepresented in the population. E) Remain the same, at Hardy-Weinberg equilibrium.
__________ are the functional units of heredity, and they code for specific __________
a. DNA; genes b. Genes; proteins c. Proteins; genes d. Nucleotides; DNA
Which human bone is found in the pectoral
girdle?
a. clavicle b. humerus c. radius d. sternum e. tibia
Virulent strains of Staphylococcus aureus can resist penicillin because they produce
A) a slime layer. B) coagulase. C) beta-lactamase. D) staphylokinase. E) lipase.