In humans, the gene for brown eye color K dominates over the gene for blue eye color K. A brown-eyed man married a blue-eyed woman

In humans, the gene for brown eye color K dominates over the gene for blue eye color K. A brown-eyed man married a blue-eyed woman. From this marriage two brown-eyed sons were born. The first son married a blue-eyed woman and they had a blue-eyed son. The second one has brown eyes. Determine: 1) the genotypes of all family members; 2) the phenotype of the children of the second son.

1) The most probable genotype of the father is KK, the mother is kk, the sons are Kk, the wife of the first son is kk, their child is kk. The wife of the second son may have both KK and Kk genotypes.
2) If the genotype of the wife of the second son is KK, then all their children will have brown eyes, if the genotype is Kk, then the children can have both brown and blue eyes in a ratio of 3: 1.

Remember: The process of learning a person lasts a lifetime. The value of the same knowledge for different people may be different, it is determined by their individual characteristics and needs. Therefore, knowledge is always needed at any age and position.