Mendel’s dihybrid crosses provided indirect
evidence for all but which one of the following?
a. independent assortment
b. dominance
c. linkage
d. presence of two factors in parents and offspring
e. segregation of factors
Answer: c
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What mechanism makes it difficult to classify bacteria into distinct species groups?
A. vertical evolution. B. horizontal gene transfer. C. sexual reproduction. D. asexual reproduction. E. low mutation rates.
If true-breeding red long radishes are crossed with true breeding white oval radishes, the F 1 will be expected to be which of the following?
A) Red and long B) Red and oval C) White and long D) Purple and long E) Purple and oval
The extinction that occurred on earth 65 million years ago was immediately followed by:
a. an increase in atmospheric oxygen levels. b. the rise of archaea. c. the emergence of the first non-photosynthetic organisms. d. the rise of reptiles, including the dinosaurs. e. the rapid divergence and radiation of modern mammals.
Which of the following structures is not a component of the hindbrain?
A. Pons B. Hypothalamus C. Medulla oblongata D. Cerebellum