The correct answer is (c) Both 1 and 2.
Explanation:
Mitochondrial diseases are genetic disorders caused by mutations in the DNA of mitochondria, which are inherited only from the mother. Mitochondrial replacement therapy (MRT) is a technique used to prevent the transmission of mitochondrial diseases from the mother to the child. MRT involves replacing the defective mitochondria of the mother`s egg with healthy mitochondria from a donor before or after in vitro fertilization. Therefore, statement 1 is correct.
As mitochondria are inherited only from the mother, a child inherits mitochondrial diseases entirely from the mother and not from the father. Therefore, statement 2 is also correct.