Albinism, lack of pigmentation in humans, results from an autosomal recessive gene (a). Two parents with normal pigmentation have an albino child. What is the probability that their next three children will be albino?
A) 0% B) 1/8 C) 3/4 D) 1/64 E) 1/4
Answer: D
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Which organ system is the principle regulatory system of the body, functioning to monitor and respond to changes in the environment?
1.A
2.B
3.C
4.D
Life began on Earth approximately ________ years ago
A) 100,000 B) 1 million C) 5 million D) 3.8 billion E) 4.6 billion
Which biome is a treeless plain that occurs around the Arctic Circle?
A. Shortgrass prairie B. Taiga C. Cold desert D. Cold grassland E. Tundra
Which of the following represents energy flow in a grazing food web?
A. Producers ? detritivores ? decomposers B. Producers ? decomposers ? detritivores C. Producers ? herbivores ? decomposers ? carnivores D. Producers ? herbivores ? carnivores ? decomposers E. Producers ? herbivores ? detritivores ? carnivores