In the context of hereditary diseases, consider the following statements:1.Passing on mitochondrial diseases from parent to child can be prevented by mitochondrial replacement therapy either before or after in vitro fertilization of egg.2.A child inherits mitochondrial diseases

1. A

   1 only

   1 only. Maternal inheritance of mitochondria is also true.

2. B

   2 only

   2 only. Mitochondrial replacement can be done around IVF.

3. C

   Both 1 and 2

   Both. MRT can be used with IVF; a child inherits mitochondrial DNA from the mother.

4. D

   Neither 1 nor 2

   Neither. Both hold.

Summary. Official key is (c) both. Mitochondrial disease is transmitted through the egg. Replacement therapy (three-person IVF and related methods) can be applied in the IVF window to break that line.