In the late 1920s, a mutation occurred in many silver fox farms around the world. The fox farms that
sold expensive furs were proud of the quality of their furs, and each advertised that it had the best,
purest breed of all the fox farms. The new mutations produced a "platinum" coat pattern that was
commercially desirable, so the farms crossed them to get more. The results of their breeding
experiments were as follows: (1) silver ? silver >>> all silver offspring; (2) silver ? platinum >>>
equal numbers of silver and platinum; (3) platinum ? platinum >>> two platinum for each silver
offspring. Explain. What will be an ideal response?
ANS: PP (silver), Pp (platinum), pp (lethal) PTS: 1 DIF: Difficult
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Otto Loewi performed an experiment in which he first electrically stimulated the vagus nerve connected to a frog heart. He then passed the fluid bathing this heart to a second chamber containing a second frog heart not connected to a nerve. What did Loewi observe?
A. There was no effect on the beating of either heart. B. The first heart showed an increase in beat rate, but there was no change in the second heart. C. The first heart showed an increase in beat rate and so did the second heart. D. The first heart showed a decrease in beat rate, but there was no change in the second heart. E. The first heart showed a decrease in beat rate and so did the second heart.
If an adult man and woman, both weighing 160 pounds, were stranded on a desert island with
no food, which individual would survive the longest on their body stores?
a. the man b. the woman c. impossible to tell d. There would be no difference because they have the same body mass
Tay-Sachs, which is a recessive lethal disease, results only when individuals possess two copies of the disease-causing allele. Which of the following statements is true about this disease?
a) Heterozygous individuals are more fit than homozygous dominant individuals, so eventually, there will only be heterozygotes in the population. b) Heterozygous individuals may pass on their copy of the disease-causing allele to offspring. c) All cases of this disease must be caused by new mutations. d) Heterozygous individuals only pass on the dominant copy of the allele to offspring. e) A homozygous individual can pass on both of the recessive genes for Tay-Sachs.
Slime molds are classified with protozoa in part because they have (flagella/pseudopods/shells).
Fill in the blank(s) with the appropriate word(s).