試題詳解

35. In the genetic self-incompatibility (SI) system of angiosperms, which molecular mechanism most commonly prevents self-fertilization?
(A) RNA-directed DNA methylation blocking pollen tube growth.
(B) Ubiquitin-mediated degradation of incompatible pollen proteins.
(C) CRISPR-like genome editing in the pollen grain before fertilization.
(D) Epigenetic silencing of self-recognition genes in the ovule.
(E) Caspase-dependent apoptosis of self-pollen after stigma contact.