In cats, short hair (L) is dominant to long hair (l). If a short-haired cat of unknown genotype is crossed with a longhaired
animal, and they produce one long-haired kitten and one short-haired kitten, this would indicate that ____.
a. the short-haired cat was true-breeding
b. the short-haired cat was not true-breeding
c. the long-haired cat was not true-breeding
d. the long-haired cat was heterozygous
e. neither parent was true-breeding
ANSWER: b
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Which of the following processes does not generate genetic variation during sexual reproduction?
A. Crossing over B. Random fertilization C. Independent assortment D. All of the processes above generate genetic variation
Consider the data in Fig. 46.8 illustrating the age structure of France and India. In many parts of the world, the average age of reproductive maturity is increasing as humans move from urban to rural environments
Suppose that the current average age of first reproduction is 15 years in India and 20 years in France. How would a 5-year increase in the average age of reproductive maturity in both countries be expected to affect the per capita birth rate, and would this effect be greater in France or in India? A. increase in per capita birth rate, greater effect in India B. increase in per capita birth rate, greater effect in France C. decrease in per capita birth rate, greater effect in India D. decrease in per capita birth rate, greater effect in France
In the late nineteenth century, immigration from Ireland to the United States occurred in high numbers due to an infection of potatoes by
A. bacteria. B. viruses. C. fungi. D. amoeboid protozoa. E. water molds.
Both smooth and cardiac muscle fibers
A) contain a single nucleus. B) have multiple nuclei. C) possess intercalated discs. D) are striated.