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Free CLEP Science and Mathematics Exam Braindumps (page: 56)

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Mendel studied the following three traits: seed shape, flower position, and stem length.



If a plant that is heterozygous for the flower position trait is fertilized with a plant that is homozygous for the recessive flower position trait, what proportion of the offspring will be heterozygous for the trait?

  1. 0%
  2. 25%
  3. 50%
  4. 75%
  5. 100%

Answer(s): C

Explanation:

The cross is Aa with aa. There are two possibilities for the offspring, Aa and aa. The plant with the heterozygous trait will donate the A gene 50% of the time, while the plant with the homozygous trait will always donate a gene.



Mendel studied the following three traits: seed shape, flower position, and stem length.



If a plant that is heterozygous for seed shape and stem length traits self-fertilizes, the proportion of offspring that will be homozygous for both traits is

  1. 1/16
  2. 1/4
  3. 1/2
  4. 3/4
  5. 1/8

Answer(s): A

Explanation:

The probability that the offspring is homozygous for the recessive traits is 1/4. The probability that the offspring is homozygous for both recessive traits is found by multiplying the probabilities together. The answer is thus (1/4) × (1/4) = (1/16).



Mendel studied the following three traits: seed shape, flower position, and stem length.



Plants with phenotype round seed shape and tall stem length are only fertilized with plants of wrinkled seed shape and dwarf stem length, and the same fertilization pattern is followed for the successive generations. Which of the following statements is true?

  1. The frequencies of the dominant genes will increase.
  2. The frequencies of the dominant genes will remain the same.
  3. The frequencies of the recessive genes will decrease.
  4. The frequencies of the recessive genes will increase.
  5. There will be no changes in the frequencies of dominant and recessive genes.

Answer(s): D

Explanation:

This is an example of selective breeding. The frequency of the genes for the phenotype being selected for will be represented in a greater proportion in successive generations.



When a red snap dragon flower is pollinated using pollen from a white snap dragon, the following number of flowers and colors is observed: 23 red, 20 white, 57 pink. The genotype of the pink flowers is

  1. RR
  2. WW
  3. RW
  4. Cannot be determined from the information provided
  5. More than one gene is involved

Answer(s): C

Explanation:

This is an example of two genes blending. The red and white genes are each expressed equally with the result that the flowers are pink.






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