BIOL-1033 Exam #4 Questions And Answers

BIOL-1033 Exam #4 Questions And
Answers


The human blood type AB in which both the A antigen and the B antigen are found embedded in the
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blood cells is an example of - (correct answer) -Codominance
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An X-linked gene is - (correct answer) -a gene on the X chromosome
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A man and a woman are both heterozygous carriers for the recessive allele that causes cystic fibrosis.
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What is the probability that they will have an offspring who has cystic fibrosis? - (correct answer) -25%
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All the offspring of a cross between a red-flowered plant and a white flowered plant have pink flowers.
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This means that the allele for red flowers is _______ to the allele for white flowers. - (correct answer) -
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incompletely dominant l/




The origin of mitochondria in a eukaryotic cell is explained by - (correct answer) -Endosymbiosis of an
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aerobic bacterium
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Which would be most likely to be fossilized? - (correct answer) -a common thick-shelled crustacean
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You uncovered a fossil that you suspect is around 100 million years old. Which of the radioisotope pairs
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in the table could you eliminate as an appropriate choice for radioisotope dating the accompanying
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rock? - (correct answer) -Carbon-14/Nitrogen-14
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The Earth's atmosphere has changed a lot over the past 4 billion years. One big change was due to
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photosynthetic organisms. Their photosynthesis increased the amount of what atmospheric gas? -
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(correct answer) -Oxygen (O2)
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The first living cells were most likely - (correct answer) -Anaerobic prokaryotes
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The process by which the major land masses have shifted their positions, changed shapes and separated
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from each other, is known as - (correct answer) -Continental drift (plate tectonics)
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The likelihood of allopatric speciation increases when a splinter population is __________ and
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__________ the broader range of the species. - (correct answer) -Small ; isolated from
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Today there are 54 different honeycreepers in Hawaii. The ancestor of the honeycreepers was the
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European rosefinch. The evolution of many species of honeycreeper is the result of - (correct answer) -
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Adaptive radiation l/




During the Beagle journey, Darwin visited islands, allowing him to compare island species with
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continental species. In terms of framing his theory of evolution, why was this significant? - (correct
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answer) -Because the island species had both similarities to their continental ancestors and unique
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adaptations to their island environments.
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