Question

To investigate the inheritance of color variegation in four-o'clocks, Carl Correns performed pairwise crosses between male (pollen) and female (ova) gametes from flowers growing on three types of branches: variegated, all white, and all green. Solid white branches are homoplasmic for mutant chloroplasts, solid green branches are homoplasmic for wild-type chloroplasts, and variegated branches are heteroplasmic for both types of chloroplasts. In a different species of variegated plant, color is determined by two codominant alleles of a nuclear gene. If all of the progeny from a cross are solid white, what can be concluded about the parent plants? Check All That Apply The ova could have come from a plant that was entirely white. The ova could have come from a branch that was solid white. The ova could have come from a branch that was solid white or variegated, but not solid green The ova could have come from a branch that was solid white, solid green, or variegated.

Answer 1

Answer: The ova could have come from a plant that was entirely white.

Reason. In codominant inheritence both the alleles have the phenotypic effect equally on the progeny. As all the F1 progeny are solid white it means the parents also have only solid white genotypes.