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two alles are the same


two alleles that are different

Phenotype & Genotype

1. the physical appearance of an organism
2. the alleles(letters) that an organism inherits


The diagram of inheritance of a trait through a family


An individual who is heterozygous but does not show the recessive trait

Universal donor and recipient

d= type O blood, r= type AB blood


Different versions of a trait


An overpowering trait that requires inheriting only one allele


A weaker trait that requires inheriting two of the same alleles.

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