Mouse Genetics (Two Traits)


Breed "pure" mice with known genotypes that exhibit specific fur and eye colors, and learn how traits are passed on via dominant and recessive genes. Mice can be stored in cages for future breeding, and the statistics of fur and eye color are reported every time a pair of mice breed. Punnett squares can be used to predict results.

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Assessment Questions (5):

  1. The diagram below shows a happy family of mice, with two parents and four offspring. However, one of the offspring mice is an imposter. The black-fur parent has the genotype FF Ee, and the white-fur parent has the genotype ff Ee. Given these parent genotypes, which offspring mouse could not have been born to these parents?

    Mouse parents and offspring
  2. In mice, black fur is dominant over white fur, and black eyes are dominant over red eyes. Which of the following is possible?
  3. The table below describes 100 offspring of the same two parents. What are the most likely genotypes of the parents?

    Data table
  4. A Ff ee mouse is bred to a ff Ee mouse. What is the probability that an offspring mouse will have black fur and red eyes?
  5. A Ff Ee mouse is bred to another Ff Ee mouse. What is the probability that an offspring mouse will be born with the genotype FF EE?

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