| ||
|---|---|---|
| Genotype | Phenotype | |
|
|
|
| BB | Bald | Bald |
| Bb | Not bald | Bald |
| bb | Not bald | Not bald |
Pattern baldness (hair is thin or absent on top of the head) is more prevalent in males, since the heterozygous genotype exhibits this phenotype only in males.
Females who do inherit the BB genotype exhibit a much less pronounced phenotype and express it later in life.