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. If hundreds of progeny from a cross are all white, what can be concluded about the parent plants? Check All That Apply The ova had to come from a plant that was entirely white. The ova had to 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 sold white, solid green, or variegated.

Answer 1

The ova had to come from a plant that was entirely white.

The conclusion is as above because the resulted 100 progenies are all white and this could happen only when the male gamete and the female gamete are from white coloured plant. The male and female gametes can be white when they belong to completely white coloured plant.