* Recessive Phenotype Means Two Recessive Alleles: A recessive phenotype (like blue eyes) means a person has two copies of the recessive allele for that trait.
* No Dominant Allele: If they had a dominant allele, they would express the dominant trait, not the recessive one.
Therefore, a person with a recessive phenotype automatically has a homozygous recessive genotype. There's no need to flip a coin.
Example:
* Trait: Eye color
* Dominant Allele: Brown eyes (B)
* Recessive Allele: Blue eyes (b)
Someone with blue eyes must have the genotype bb because if they had even one "B" allele, they would have brown eyes.
Where the "Coin Flip" Comes In
The "coin flip" idea might arise when we consider a person who expresses a dominant trait. Let's say someone has brown eyes. We know their genotype could be either:
* BB (homozygous dominant)
* Bb (heterozygous)
In this case, we can't know for sure without additional information (like the parents' genotypes). This is where a Punnett square or a genetic test could help.
