Limiting Factors
A number of conditions exist that limit the success of hybridization, the most obvious is great genetic diversity between most species. But in animals and plants that are more closely related hybridization barriers can include morphological differences, differing times of fertility, mating behaviors and cues, physiological rejection of sperm cells or the developing embryo.
In plants, barriers to hybridization include blooming period differences, different pollinator vectors, inhibition of pollen tube growth, somatoplastic sterility, cytoplasmic-genic male sterility and structural differences of the chromosomes.
Read more about this topic: Mammal Hybrids
Famous quotes containing the words limiting and/or factors:
“Do we honestly believe that hopeless kids growing up under the harsh new rules will turn out to be chaste, studious, responsible adults? On the contrary, by limiting welfare, job training, education and nutritious food, won’t we plant the seeds for another bumper crop of out-of-wedlock moms, deadbeat dads and worse?”
—Richard B. Stolley (20th century)
“Girls tend to attribute their failures to factors such as lack of ability, while boys tend to attribute failure to specific factors, including teachers’ attitudes. Moreover, girls avoid situations in which failure is likely, whereas boys approach such situations as a challenge, indicating that failure differentially affects self-esteem.”
—Michael Lewis (late–20th-century)