Primary and secondary succession are two types of ecological succession (succession of colonization of species in an ecosystem in a barren or destroyed habitat).
Primary Succession:
Primary succession is the the colonization of a barren area of land that is completely devoid of soil.
Secondary succession:
Secondary succession occurs in an area with ample soil but which has been destroyed by human intervention or natural disasters such as a wild fire or volcanic eruption.
I believe you meant the allele for round seeds (R) is dominant to the allele for wrinkled seeds (r). The cross between RR and rr is all Rr, all will have rounds seeds.