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geminate species pair
Two little-differentiated species evolved from a close common ancestor.
gene frequency
The number of occurrences of an allele in a gene pool.
gene pool
The complete set of unique alleles in a species or population.
A single step or stage in the succession of natural descent.
genetic drift
Change in the gene pool that occurs when the frequency of an allele changes over generations due to random chance.
The genetic makeup of an organism or group of organisms with reference to a single trait, set of traits, or an entire complex of traits. (adj. genotypic)
The specialized larval form of freshwater pearl mussels that usually has hooks that enable it to attach itself to a host (e.g., to the gills of a fish) for a period of time before it detaches and falls to the bottom and takes on the typical form of a juvenile mussel. (pl. glochidia)
The process of gradual evolutionary change over time.
gross anatomy
Anatomy of organs and their arrangements, usually studied without the use of high magnification.