In a three-point mapping experiment, how many different genotypic classes are expected?
A) 0 B) 4 C) 2 D) 8 E) 1
Answer: D
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Larval salamanders eat small insects and crustaceans. These insects and crustaceans are
herbivores. Thus, the salamanders belong to the __________ trophic level.
a. first b. second c. third d. fourth
Dalton's Law states that:a
the amount of a gas that diffuses across a membrane depends on the differences in the gas' partial pressure. b. the ability of hemoglobin to bind oxygen depends on the partial pressure of oxygen. c. in a mixture of gases, the total pressure of the mixture is the sum of the pressures of the individual gases. d. pH causes a displacement of the oxygen-hemoglobin dissociation curve. e. as the concentration of chloride ions increases, the ability of hemoglobin to bind carbon dioxide decreases.
Variations of homologous genes that result in differences in structure and function are
A) alleles. B) loci. C) autosomes. D) dominant. E) linked.
Which mechanism causes postzygotic reproductive isolation?
A. habitat isolation B. mechanical isolation C. hybrid sterility D. temporal isolation