Rank the following pairs of potential parents in the order of increasing likelihood that they produced the pro

Snapdragons are angiosperms (flowering plants) that exhibit incomplete dominance in the inheritance of flower color. Your colleague collected progeny from several snapdragon crosses. Then she threw out the parents… along with her lab notebook. As a result, she has no record of which parental crosses gave rise to which sets of progeny.





a.) She asks you to determine the parent phenotypes of two progeny (F1) that came from the same parental cross (P1). Both progeny have white flowers. Rank the following pairs of potential parents in the order of increasing likelihood that they produced the progeny:





(i) pink snapdragon X pink snapdragon;


(ii) red snapdragon X white snapdragon;


(iii) pink snapdragon X white snapdragon.





b.) Repeat what you did in (a) for the following progeny: two white, one pink and two red flowers.





For both (a) and (b), explain your reasoning for each ranking in words and by drawing Punnett Squares.

Rank the following pairs of potential parents in the order of increasing likelihood that they produced the pro
A key point in answering is to understand incomplete dominance: the phenotype of the offspring is intermediate between the parental phenotypes (it appears the parental types "blended", rather than the offspring showing only the phenotype of the dominant allele.) So which parental types in the example have MORE white in them, and therefore would be MORE likely to produce white offspring? Another hint: in order to be red, the plant must have only the dominant R alleles.