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 a cross produces hundreds of progeny that are a mixture of white, green and variegated, what can be concluded about the parent plants? Check All That Apply The ova had to come from a branch that was varlegated. The ova could have come from a branch that was variegated or solid green, but not solid white. The ova could have come from a branch that was solid white, solid green, or variegated. The pollen had to come from a branch that was varlegated.

Answer 1

Variegation in plants is an example of cytoplasmic inheritance or maternal inheritance. ovum In maternal (cytoplasmic) inheritance the truits of the progenies are maternal in origin because of the expression of extranuclear DNA that is found in the at the time of fextilization A plant known as four o'clock plant (mirabillis Falapa) have either white, green of variegated (white and Green) leaves. This trait of leaf Color is tranferred in the next generation by the maternal parent through cytoplasmic inheritance cross between the Different leaf color plants: Phenotype of Phenotype of male plant parent progenies Crreen Coreen Green white Vorieguted Phenotype of female plant parent Creen green white breen white variegated & white & white white vorieguted reen, white variegated (white/green Noriegated (white/green variegated (white/green variegated

on the basis of above Explanation, we can see that leaf color (white/green/variegated) is totally depend on the female parent plant Blue to cytoplasmic inheritance. ova All three types of progenies (white, green and variegated) will be produced only if the had to come from a branch that was variegated So, the only first option is correct Y The ova had to come from a branch that was vanegated.