Problem:

You have discovered an interesting new leaf color variant in pea plants. You have some wild-type plants with the typical green leaf color and some plants with all yellow leaves. You suspect that a mutation in the chloroplast genome may be responsible for this change in pigment.

Required:

Question 1: Describe a crossing experiment that you could conduct to test this hypothesis.

Question 2: What results would you expect to find if your suspicion is correct that the mutation that is responsible for the yellow-leaf phenotype is in the chloroplast genome?

So could someone explain this to me?