Mammoth Memory

Genotype = two letters

The father's and mother's gene segment that defines a characteristic is called a genotype. It is usually represented by two letters.

It’s easiest to remember what a genotype is when you think of it as meaning two letters.

Genotype is the meaning of 2 inherited alleles at once

The jeans can type (genotype) two letters at once.


Magnified diagram of both inherited alleles from mother and father together are called genotypes

Each possible genotype can be shown using a punnet square.


In this example the mother has brown eyes but carries one brown eye allele and one blue eye allele. The father is also brown eyed but again carries one blue eye allele and one brown eye allele.

Annotated punnet diagram of possible genotype sequences

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