| Heterotrophic organisms must acquire nutrients to maintain somatic and gametic function. |
| But, because only one individual is involved, there is no exchange of gametic nuclei. |
| Simultaneous analysis of the haploid megagametophyte and diploid embryo in a seed allows the female and male gametic contributions to the zygote to be separated. |
| A bridge of cytoplasm forms between the two ciliates, and one gametic nucleus from each cell passes into the other cell. |
| The main objective of the action is to discover the biological controls of gametic embryogenesis and to exploit these in plant breeding. |
| The two gametic nuclei in each cell unite, thus restoring the diploid number of chromosomes. |
