By the year 1980, a wolf species (Canis rufus) once common to the southeastern region of the United States disappeared from all areas except for one small part of eastern Texas. This is an example of
A) extirpation.
B) extinction.
C) species invasion.
D) genetic diversity.
Answer: A
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If genetically identical strains of corn are grown in different environments, then differences in height would be due to the environment and:
A. the heritability measure would be 100%. B. the heritability measure would be 0%. C. the heritability measure would indicate that the environment has no effect on inheritance of the trait. D. the heritability measure would indicate that the genotypic differences have no effect on the inheritance of the trait. E. None of these answer options is correct.
Which of the following is(are) true about
predator-prey coevolution? a. Each species exerts selection pressure on the other. b. Predators are selective agents that favor improved prey defenses. c. Prey with better defenses are selective agents that favor better predator hunting skills. d. All of the above are true. e. None of the above are true
As latitude increases, the number of terrestrial species ________
Fill in the blank(s) with correct word
Which of the following characteristics of the structure of DNA was determined directly from X-ray diffraction photographs of crystallized DNA?
A. the double helical structure B. the length of a given DNA molecule C. the frequency of A versus T nucleotides D. the sequence of nucleotides