fertilization
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- The union of two gametes from opposite sexes to form a zygote. Typically, each gamete contains a haploid set of chromosomes. Hence the zygotic nucleus contains a diploid set of chromosome s. Several categories can be distinguished: 1. Self-fertilization (selfing): fusion of male and female gametes from the same individual. 2. Cross-fertilization (crossing): fusion of male and female gametes from different individuals. 3. Double fertilization; restricted to flowering plants, in which the fusion of one male gamete with the ovum occurs at about the same time as the second male gamete nucleus fuses with the female polar nuclei (or secondary nucleus) to form the endosperm.
UN Food and Agriculture Organization - Cite This Source - This Definition - androgenesis, asexual propagation, egg, germ line gene therapy, karyogamy, polyspermy, pro-nucleus, Pronucleus, reproduction, Sexual reproduction, zygote
- The process whereby male and female gametes unite.
The President's Council on Bioethics - Cite This Source - This Definition - The joining of the male gamete (sperm) and the female gamete (egg).
NIH - Cite This Source - This Definition - The process whereby male and female gametes unite.
DHHS - Cite This Source - This Definition - Gamete, Germ cell, Germ cells (or primordial germ cells), Primordial germ cell, Somatic cell, Somatic cells, Somatic stem cells
- A term used to denote efforts to enhance plant growth by increased application of nitrogen-based fertilizer or increased deposition of nitrates in precipitation.
EPA - Cite This Source - This Definition - Compost, Composting, Fertilization, Carbon Dioxide, fertilizer, Inorganic fertilizer, Manure, Nitrous Oxide (N2O), Organic fertilizer, Synthetic fertilizer