Here we have the alleles H - no horns and h - horns, and the individuals that have horns (hh) are represented in the pedigree with a red filling.
• The parents in generation, ,I, ,are ,hh (I-1) , and ,HH (I-2),, so all of their children in generation II will be ,Hh, ,(II-2, II-3, II-5),.
,
• II-4, ,is red,, so it has a ,hh, genotype.
,
• II-1 y II-2 have no horns, but one of their children does ,(III-3, hh),, which means, II-1, also carries the recessive allele ,(Hh,).
,
• III-4, ,is red,, so it has a ,hh, genotype
,
• III-5 is Hh, because their mother is hh.
In summary, the genotypes would be as follows:
Generation I:
0. hh
,
1. HH
Generation II:
0. Hh
,
1. Hh
,
2. Hh
,
3. hh
,
4. Hh
Generation III:
0. HH
,
1. Hh
,
2. hh
,
3. hh
,
4. Hh