Regents Prep: Living Environment
Multiple-Choice Questions
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Use of Topical Archive Multiple-Choice Questions
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Genetic Engineering: Question 1 of 3
Breeders have developed a variety of chicken that has no feathers. Which methods were most likely used to produce this variety?
  1. artificial selection and inbreeding
  2. grafting and hybridization
  3. regeneration and incubation
  4. vegetative propagation and binary fission

Correct Answer Number: 1

Explanation: A chicken born without feathers was orginally a mutation but farmers liked the idea since they wouldn't have to pluck them then. So when the nonfeathered chicken appeared they purposely bred it (called artificial selection) and when any nonfeathered offspring were bred together (inbreeding) to produce a whole new variety of chicken.


Genetic Engineering: Question 2 of 3
Mendel's discovery that characteristics are inherited due to the transmission of hereditary factors resulted from his
  1. careful microscopic examinations of genes and chromosomes
  2. dissections to determine how fertilization occurs in pea plants
  3. breeding experiments with many generations of fruit flies
  4. analysis of the offspring produced from many pea plant crosses

Correct Answer Number: 4

Explanation: Gregor Mendel used simple mathematics and kept careful records of his pea plant crossed to arrive at his conclusions. He did know about genes and did no dissections.


Genetic Engineering: Question 3 of 3
Which is a breeding method used by humans to produce new and improved varieties of plants and animals?
  1. independent assortment
  2. crossing-over
  3. artificial selection
  4. natural selection

Correct Answer Number: 3

Explanation: If a farmer sees a plant or animal with exceptional characteristics, he or she may purposely breed that plant or animal with a similar one with similar characteristics to perpetuate those desirable traits. Natural selection is when the plant or animal breed without any intervention from humans.
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