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ym maes bioleg Dyma ddiffiniad o'r term: In evolutionary biology, an adaptive radiation is the evolution of ecological and phenotypic diversity within a rapidly multiplying lineage.[1] Starting with a recent single ancestor, this process results in the speciation and phenotypic adaptation of an array of species exhibiting different morphological and physiological traits with which they can exploit a range of divergent environments. [1] a fyddai pelydriad ymaddasol yn gwneud y tro? Dw i ddim mor siwr am 'pelydriad'. Unrhyw sylwadau ogydd? Martin