J A Moore investigated the inheritance of spotting patterns

J. A. Moore investigated the inheritance of spotting patterns in leopard frogs (J. A. Moore, 1943, Journal of Heredity 34:3-7). The pipiens phenotype had the normal spots that give leopard frogs their name. In contrast, the burnsi phenotype lacked spots on its back. Moore carried out the following crosses, producing the progeny indicated. Give the MOST likely genotypes of the parent in each cross using burnsi (pp) times burnsi (Pp); burnsi (Pp) times pipiens (pp) burnsi (Pp) times pipiens (pp); burnsi (Pp) times burnsi (Pp); burnsi (Pp) times pipiens (pp) burnsi (Pp) times pipiens (pp) burnsi (Pp) times burnsi (Pp); burnsi (PP) times pipiens (pp); burnsi (PP) times pipiens (pp) burnsi (Pp) times burnsi (Pp); burnsi (Pp) times pipiens (pp); burnsi (Pp) times pipiens (pp) burnsi (Pp) times burnsi (Pp); burnsi (Pp) times pipiens (pp); burnsi (pp) times pipiens (pp)

Solution

a).brunsi (Pp) x brunsi (Pp) ; brunsi (Pp) x pipens (pp); brunsi (Pp) x pipiens (pp)

b). With one degree of freedom. the chi-square value is greater than 2.706 for a probability value of less than 0.1, so the deviation between observed and expected was not likely to occur by chance.