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traits, genes, and alleles (alleles (alternative form of gene located at…

- - - - they can be
        
        homozygous
        
        two of the same alleles at the same locus of sister chromatid
        
        heterozygous
        
        two different alleles that appear at the same locus of sister chromatid
    - - dominant
        
        two different alleles are present in an organism’s genotype
      - recessive
        
        two copies are present in an organism’s genotype
- - - - genotype
        
        collection of all of an organism’s genetic information that codes for traits
      - phenotype
        
        collection of all of an organism’s physical characteristics
- - - - locus
        
        a specific position on a pair of homologous chromosomes
      - alleles