\(B\) represents the dominant gene (black hair) and \(b\) represents the recessive gene (brown hair). 

In order to determine the genotypes and phenotypes of the first generation, we need to construct monohybrid crosses of the inheritance mechanism. 

Since \(B\) is dominant, \(BB\) and \(Bb\) display black hair. 

Note that \(Bb\) is heterozygous dominant. 

Hence, the ratio of black hair to brown hair is \(3:1\). 

\(B\) mewakili gen dominan (rambut hitam) dan \(b\) mewakili gen resesif (rambut coklat).

Untuk menentukan genotip dan fenotip generasi pertama, kita perlu membuat persilangan monohibrid mekanisma pewarisan.

Disebabkan \(B\) adalah dominan, \(BB\) dan \(Bb\) menghasilkan rambut hitam.

Perhatikan bahawa \(Bb\) adalah heterozigot dominan.

Oleh itu, nisbah rambut hitam ke rambut coklat adalah \(3:1\).

\(B\) represents the dominant gene (black hair) and \(b\) represents the recessive gene (brown hair). 

In order to determine the genotypes and phenotypes of the first generation, we need to construct monohybrid crosses of the inheritance mechanism. 

Since \(B\) is dominant, \(BB\) and \(Bb\) display black hair. 

Note that \(Bb\) is heterozygous dominant. 

Hence, the ratio of black hair to brown hair is \(3:1\).