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 new species of variegated plant, color is determined by mutations in a chloroplast gene and chloroplasts are inherited from both parents. 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 varlegated, but not solid green The ova could have come from a branch that was solid white, solid green, or variegated.

Answer 1

Answer :- "B" i.e The ova could have come from a branch that was solid white.

Explanation :- We know the colour variegations of four-o-clock plant is a phenomenon of cytoplasmic inheritance or maternal inheritance. Maternal inheritance is a phenomenon where phenotype of the progeny is determined by the genotype of the female parents i.e in this case phenotype is as like as female parents. It can't depends on male parent. This cytoplasmic inheritance can't follow the normal Mendelian inheritance.

So according to the question here all the progeny are solid white that means here female parents is also solid white. So here the ova come from solid white branch.

ot Х Solid White any branch U Solid white Call progeny) Figin in four-o-clock Maternal inheritence Plant

So from the above discussion we can conclude that the answer is option B.