In Drosophilia melanogaster, commonly known as the fruit fly, the recessive eye color allele causes the flies to have very dark colored eyes. The dominant eye color allele
causes the fruit flies to have normal red eyes. Two fruit flies are crossed and they
produce several hundred offspring. Tweny-five percent of their offspring exhibit the
dark eye color allele.
Which of the following statements best describes the assumption that can be
formulated about the parental generation?