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A cleft chin is a dominant trait found in humans. If a homozygous recessive mother has a baby with a homozygous dominant father, what is the likelihood the baby will have a cleft chin?

Question

A cleft chin is a dominant trait found in humans. If a homozygous recessive mother has a baby with a homozygous dominant father, what is the likelihood the baby will have a cleft chin?

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Solution

The likelihood of the baby having a cleft chin is 100%.

Here's the step-by-step explanation:

  1. A cleft chin is a dominant trait. This means that if an individual has at least one dominant gene (represented by 'A'), they will have a cleft chin.

  2. A homozygous dominant individual has two dominant genes (represented by 'AA').

  3. A homozygous recessive individual has two recessive genes (represented by 'aa').

  4. When the homozygous dominant father (AA) and the homozygous recessive mother (aa) have a baby, the baby will inherit one gene from each parent.

  5. Therefore, the baby will have one dominant gene and one recessive gene (represented by 'Aa').

  6. Since the presence of at least one dominant gene results in a cleft chin, the baby will have a cleft chin.

So, the likelihood of the baby having a cleft chin is 100%.

This problem has been solved

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