5 résultats pour "spéciation"
- spéciation.
- cladogenèse ou spéciation , n.
- spéciation spéciation, ensemble des phénomènes qui concourent à l'apparition de nouvelles espèces animales et végétales.
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Zoology - biology.
is still in its infancy and is quite controversial, chiefly because it has raised anew the old dispute about whether behavior is genetically determined. See Animal Behavior; Sociobiology. Embryology, the study of the development of individual animals, has investigated the way in which developing parts interact—for example, the interactions between theeyestalk and the epidermis during development of the lens of the eye. The emerging field of molecular development applies the techniques of molecu...
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Evolution - biology.
genetic diversity to extinction. Sexual reproduction ensures that the genes in a population are rearranged in each generation, a process termed recombination. Although the combinations of genes inindividuals change with each new generation, the gene frequency, or ratio of different alleles in the entire population, remains relatively constant if no evolutionaryforces act on the population. One such force is the introduction of new genes into the genetic material of the population, or gene pool...