When Crossing a True-Breeding Red Snapdragon Flower with a True-Breeding

question 56

Multiple Choice

When crossing a true-breeding red snapdragon flower with a true-breeding white flower of the same species, we secure all pink offspring. 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 because

• A) in the case of incomplete dominance, only radioactive isotope tracers can follow the actual hereditary particles.
• B) under blending theory, over many generations only the average (or pink flowers) would remain; there would be no way to get back to pure red and white.
• C) it is possible to cross the pink F-1 generation and secure a predictable proportion of pure red and white flowers again, which is not accounted for under the blending theory.
• D) there is no way to directly prove incomplete dominance is not a case of blending, but we can be sure of genes because of the other cases of dominance, etc., where genes are the only logical explanation.
• E) two of these are true.

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