The brother and sister had full lips, a feature they inherited from their father. My sister married

| August 17, 2021 | education

The brother and sister had full lips, a feature they inherited from their father. My sister married a young man with thin lips. The brother married a girl with full lips, whose mother had this feature, but her father did not. Determine what kind of children can be born in the families of a sister and brother?

Answer: my sister has 50% full and 50% with thin lips, and my brother has 75% with full lips and 25% with thin lips.

Judging by the condition of the assignment, the inherited feature of full lips from the father indicates that the mother had thin lips, respectively, their children were heterozygotes – Aa. My sister married a thin-lipped man (aa), their children 50% Aa will have full lips, and 50% will have thin aa. For a brother, the situation is different, and he and his wife are heterozygous for this trait Aa, which means that there is a 75% probability of having children with full lips and 25% with thin ones.



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