The percent oxygen saturation of hemoglobin is highest in the:
a. tissues where oxygen concentration is lowest.
b. tissues where oxygen concentration is highest.
c. venules where oxygen concentration is lowest.
d. pulmonary capillaries where oxygen concentration is lowest.
e. pulmonary capillaries where oxygen concentration is highest.
e
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Considerably more phenotypic variation exists in domesticated varieties of species like dogs and cabbages than exists in non-domesticated species like lions and maple trees. Which one of the following statements best explains why this is true?
A. There is no selection and mating is random under domestication. B. During domestication, very high rates of mutation are induced. C. Genetic drift is important because domestication involves small populations. D. Many domesticated varieties would not survive in the natural world. E. Domesticated species exhibit "hybrid vigor" (heterosis).
____ moves outward from the origin and breaks hydrogen bonds between DNA nucleotides
Fill in the blank with the appropriate word.
In a large population of plants, notches in the leaves are caused by a dominant allele N and lack of notches by a recessive allele n. Over many generations the proportion of plants in the population with notched leaves increases. What is the most likely
cause? A) Dominant alleles generally increase in frequency over time. B) The recessive alleles were all masked by the dominant alleles. C) Directional selection favored plants with notched leaves. D) Genetic drift caused a steady movement toward a greater proportion of plants with notched leaves.
The alternate forms of a gene are called
A) chromosomes. B) loci. C) alleles. D) genomes.