Practice Quiz

MCAS Biology Practice - Question List

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121. In sheep, the allele for white wool (W) is dominant, and the allele for black wool (w) is recessive. A farmer has mated two Suffolk sheep for a few years. These matings have resulted in six offspring, four with white wool and two ith black wool. One parent has white wool and the other has black wool.Which of the following could be the genotypes of the parent sheep?
  1. WW and Ww
  2. WW and ww
  3. Ww and Ww
  4. Ww and ww
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122. There is a limit to how large any given population can grow. Which of the following statements best explains why apopulation must eventually stop growing?
  1. A low female-to-male ratio develops in the population as it grows.
  2. Old individuals outnumber juveniles in the population as it grows.
  3. The resources available are fully used by the population as it grows.
  4. Natural selection changes the gene pool of the population as it grows.
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123. In pea plants, the genes for seed color and seed shape are on different chromosomes. Which of the following explains why the genes for these traits are not inherited together?
  1. natural selection
  2. artificial selection
  3. the law of segregation
  4. the law of independent assortment
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124. On remote islands, immigration and emigration usually do not have a large effect on population sizes. A bird population on a remote island remains at a relatively constant size year after year. Which of the following most likely describes the birthrate and the death rate for this population?
  1. Birthrate and death rate are both zero.
  2. Birthrate and death rate are close to equal.
  3. Birthrate is significantly less than death rate.
  4. Birthrate is significantly greater than death rate.
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125. If scientists search other planets for possible life, they are likely to focus on the presence of molecules containing which of the following elements?
  1. carbon
  2. iron
  3. potassium
  4. sodium
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