In pattern baldness, which genotype results in a bald male or bald female?

In the context of pattern baldness, which is a trait influenced by genetics, the genotype that typically leads to baldness in males and females can be associated with the presence of certain alleles. Male pattern baldness is commonly linked to the X chromosome and can be influenced by the androgen receptor gene. The dominant allele associated with baldness is often represented in a way that males with one or more copies of the baldness allele express the bald phenotype.

The genotype BB, where both alleles are dominant, implies that an individual has the genetic information necessary to express the trait of baldness clearly. This is especially pertinent in males, as they only need one copy of the allele on their X chromosome to exhibit baldness. In females, if they carry two copies of the dominant baldness allele (BB), they too are likely to exhibit baldness due to having two doses of the genotype associated with the trait.

Understanding the dominance of the alleles and their expression across genders helps clarify why having the BB genotype is sufficient for an individual to exhibit baldness regardless of sex.