The system is called heteromorphic self-incompatibility, and the general'strategy'of stamens separated from pistils is known as herkogamy.
12.
Seed producing plants, which include the angiosperms and the gymnosperms, have heteromorphic alternation of generations with large sporophytes containing much reduced gametophytes.
13.
They differ from the ancestral Crioceratidae in that, like the Ancyloceratidae, they are truly heteromorphic ( crioceratids aren't ) with distinct growth phases.
14.
Although distinct in character and not truly heteromorphic the Crioceratidae were included in the American TreatisePart L, 1957, in the Ancyloceratidae as the subfamily Crioceratinae.
15.
In this species, there is a physical dimorphism : one type is cryptic ( heteromorphic ) and the other type looks like a male ( andromorph ).
16.
Heteromorphic flowers have short carpels and long stamens, or vice versa, so animal pollinators cannot easily transfer pollen to the pistil ( receptive part of the carpel ).
17.
The initial part ( juvenile stage ) of the shell is generally more or less involute ( tightly-coiled ) and compressed, giving no hint of the heteromorphic shell form yet to come.
18.
"' Heterostyly "'is a unique form of self-incompatibility, termed heteromorphic self-incompatibility, that is, the pollen from a flower on one morph cannot fertilize another flower of the same morph.
19.
His work on " Batrachospermum " and " Sirodotia " of the Batrachospermales, established the existence of a heteromorphic alternation of generations, the sporophyte being filamentous and bearing a highly modified type of sporangium involving the formation of elimination cells during a modified meiotic process.
20.
While studying and teaching at the University of Pennsylvania, Carothers traveled to the southern and southwestern regions of the United States on research expeditions, held in 1915 and 1919 . During her time at the University of Iowa, she completed her most important work, in the field of genetics and cytology, using grasshopper embryos to study the independent assortment of heteromorphic homologous chromosomes.
