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Because a genotype is symbology for the actual alleles of a particular gene. Since all genes come in pairs (on the 22 pairs of body chromosomes), one from each chromosome. Examples: BB Bb or bb . Usually capital letters are used to describe dominant alleles and lower case for recessive alleles.

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16y ago
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3d ago

Genotypes are written with two letters to represent the two alleles inherited from each parent. The letters represent different forms of a gene, with one letter from the mother and one from the father, to show the genetic composition of an individual for a particular trait.

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Q: Why are genotypes written with two letters?
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