The nurse in the genetics clinic is helping mothers understand the causes of their children's genetic disorders. The nurse will explain how monosomy from nondisjunction during meiosis caused the disorder in the child with:
1. Classic Turner's syndrome.
2. Mosaic Down syndrome.
3. Mosaic Edwards' syndrome.
4. Duchenne's muscular dystrophy.
1
Rationale:
1. Classic Turner's syndrome is caused by monosomy resulting from nondisjunction during meiosis.
2. Mosaic Down syndrome is caused by trisomy resulting during mitosis several generations after conception.
3. Mosaic Edwards' syndrome is caused by trisomy resulting during mitosis several generations after conception.
4. Duchenne's muscular dystrophy has no relation to the cell division patterns, since it is an X-linked recessive disease.
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