A hermaphroditic plant species has 5 alleles at itsself-compatibility locus, S1, S2, S3, S4, S5. The genotype ofthe stigma is S3S4. A pollen grain lands on the stigma withthe genotype S1S3. In this case, A. the pollen grain germinatesand fertilizes an ovule. B. the pollen grain aborts. […]