Genes and Loci


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•  A gene is a heritable factor that consists of a length of DNA and influences a specific trait

•  A gene occupies a specific position on a chromosome

DNA is the genetic blueprint which codes for, and determines, the characteristics of an organism

  • This includes the physical, behavioural and physiological features of the organism

DNA is packaged and organised into discrete structures called chromosomes 

  • A gene is a sequence of DNA that encodes for a specific trait (traits may also be influenced by multiple genes)
  • The position of a gene on a particular chromosome is called the locus (plural = loci)

Genes and Gene Loci

gene and loci