| Hence selection of biparental forms is a precarious process, now going forward, now backwards, now standing still. |
| The estrildids are all monogamous and exhibit biparental care. |
| In colonially nesting Razorbills, a seabird traditionally viewed as monogamous with biparental care, both sexes attend mating arenas to obtain extrapair copulations. |
| Even population diffentiation for maternal and biparental gene markers in Eugenia uniflora, a widely distributed species from the Brazilian coast Atlantic rain forest. |
| Both the androgenetic origin of the CHM and the biparental origin of normal villous tissue were confirmed by DNA genotyping analysis. |
| For example, species without care or with uniparental care are expected to show higher levels of polygamy than do species with biparental care. |
