__________ counters the effects of mutation, natural
selection, and genetic drift. Fill in the blank(s) with the appropriate word(s).
Answer: Gene flow
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Staphylococcus aureus is known to cause ALL of the following diseases EXCEPT
A) acne. B) arthritis. C) boils. D) dental caries.
Notch and Delta are both transmembrane proteins involved in cell communication in the developing nervous system of vertebrate animals. What makes Notch different from Delta?
A. Notch is a receptor and Delta is a signaling molecule. B. Notch is a signaling molecule and Delta is a receptor. C. Notch is required at higher density than Delta to alter cell fate. D. All of the above statements are correct.
Which of these statements is true?
a. Environment can readily alter some genotypes. b. Genotype is manifested in phenotype. c. Genetic variation is easier seen than phenotypic variation. d. Variation dies with individuals. e. Phenotype is seen physically in the genotype.
Which of the following is true of radiometric dating?
A) A mineral that is 10,000 years old would best be dated with radioactive potassium. B) A mineral that is 1 billion years old would best be dated with radioactive carbon. C) Radioactive potassium-to-radon gas ratio can be used to date minerals. D) One can infer the age of a fossil by radiometric dating of the minerals found near the fossil. E) Carbon-14 decays with a half-life of 60,000 years.