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andrew-mc [135]
3 years ago
11

Are the members of the third generation still carriers/affected by the trait? How many

Biology
1 answer:
Ann [662]3 years ago
5 0

Answer:

When a genetic disorder is diagnosed in a family, family members often want to know the likelihood that they or their children will develop the condition. This can be difficult to predict in some cases because many factors influence a person's chances of developing a genetic condition. One important factor is how the condition is inherited. For example:

Autosomal dominant inheritance: A person affected by an autosomal dominant disorder has a 50 percent chance of passing the mutated gene to each child. The chance that a child will not inherit the mutated gene is also 50 percent. However, in some cases an autosomal dominant disorder results from a new (de novo) mutation that occurs during the formation of egg or sperm cells or early in embryonic development. In these cases, the child's parents are unaffected, but the child may pass on the condition to his or her own children.

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Recessive traits are expressed only when two recessive alleles are present

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This person would be homozygous dominant and would not pass on the disease because they do not have any cystic fibrosis alleles.

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