A Plant Has Green Leaves with Multiple Yellow Spots

question 18

Multiple Choice

A plant has green leaves with multiple yellow spots. When used as an egg donor in a cross with a normal plant that has all green leaves, some of the progeny have green and yellow leaves and some have all green leaves. When used as the pollen donor in a cross with a normal plant, all the progeny have all green leaves. Which of the following statements explain(s) the result of this cross? (Select all that apply.)

• A) The original plant with green leaves with multiple yellow spots is likely heteroplasmic for a mutation in the chloroplast genome.
• B) The yellow spots are cells that, by replicative segregation, have received only mutant chloroplast genomes.
• C) The plants with yellow leaves that originate from the plant with yellow spots as the egg donor received the mutant chloroplast maternally.
• D) Presumably, eggs that are heteroplasmic for mutant chloroplasts will not produce viable plants.
• E) When the plant is the pollen donor, the plant with nonmutant chloroplast DNA will contribute the chloroplasts, and all progeny will have all green leaves.

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