phylogeny

1. the evolutionary origin and development of a particular group of organisms. Also called phylogenesis. Compare ontogeny.

2. a diagram that shows genetic linkages between ancestors and descendants. Also called phylogenetic tree. —phylogenetic adj.

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Psychology term of the day

November 18th 2024

adolescent sex changes

the physical and physiological changes that start at puberty. They include accelerated development of sex organs, the appearance of secondary sex characteristics, and the first occurrence of seminal ejaculation in boys and menstruation in girls.