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D

DNA


1) deoxyribonucleic acid - A double helic, containing ....

2) A long linear polymer found in the nucleus of a cell and formed from nucleotides and shaped like a double helix; associated with the transmission of genetic information

dominant


1) An allele which is always expressed in an individual.
 (Adapted from Edexcel GCSE SCience and Data Resource Book, UG005206) 


2) An allele that produces the same phenotype whether its paired allele is identical or different