When crossing a true-breeding red snapdragon flower with a true-breeding white flower of the same species, all offspring are pink. This would seem to support the pre-Mendel view that inheritance is a blending of parental traits. However, Mendel and conventional wisdom agree that "blending" of parental traits is not correct and that particles of inheritance are actually involved. Which of the following statements supports the idea of particulate inheritance? Select all that apply.A) Two parents that show the incompletely dominant phenotype produce some offspring that are red and some that are white.B) Over many generations of crossing individuals with the incompletely dominant phenotype, all the progeny are pink.C) There is no way to directly prove that incomplete dominance is not a case
of blending.D) In meiosis, alleles of different genes assort independently of each other during gamete formation.
What will be an ideal response?
A, D
If blending were true, over many generations only the average (or pink flowers) would remain, there would be no way to get back to pure red and white. However, it is possible to cross the pink F1 generation and produce pure red and white flowers again, which is not accounted for under the blending theory. The idea of particulate inheritance is supported by our understanding of meiosis and that alleles of different genes assort independently of each other during gamete formation.
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