Determine the F1 generation if a homozygous widow's peak married to a homozygous frontal hair line female, parent genes BB, Bb, bb.

Kutokana na maelezo, "widow's peak" ni sifa kuu (dominant) na "frontal hairline" ni sifa fiche (recessive). Tunatumia $B$ kwa "widow's peak" na $b$ kwa "frontal hairline".
Mwanamume mwenye "homozygous widow's peak" ana jeni $BB$.
Mwanamke mwenye "homozygous frontal hairline" ana jeni $bb$.

Mwanamume ($BB$) atazalisha gameti zote zenye $B$.
Mwanamke ($bb$) atazalisha gameti zote zenye $b$.

Kizazi cha F1 kitakuwa na jeni $Bb$.

Kwa kuwa $B$ ni sifa kuu, viumbe vyote vyenye jeni $Bb$ vitaonyesha sifa ya "widow's peak".

Kizazi cha F1:
Genotype: $Bb$
Phenotype: Widow's peak