Question
Given below are two statements: one is labelled as Assertion A and the other is labelled as Reason R
Assertion A: Father with mitochondrial gene defect cannot transmit the disease to his offspring.
Reason R: Mitochondria are the cell organelles which contain DNA.
In the light of the above statements, choose the most appropriate answer from the options given below
This question was previously asked in
CUET PG 2026 Agri-Business Management Question Paper (25-Mar-2026) (Shift 2)
The correct answer is
Both A and R are correct but R is NOT the correct explanation of A
Analysis of Assertion A and Reason R
Assertion A: Paternal Transmission of Mitochondrial Defects
Assertion A states that a father with a mitochondrial gene defect cannot transmit the disease to his offspring.
- Mitochondrial DNA (mtDNA) is primarily inherited through the maternal line.
- During fertilization, the vast majority of paternal mitochondria (from the sperm) are excluded from the zygote or degraded.
Therefore, Assertion A is correct.
Reason R: Mitochondria Contain DNA
Reason R states that mitochondria are cell organelles which contain DNA.
- This is a well-established biological fact. Mitochondria possess their own genetic material, known as mitochondrial DNA (mtDNA).
Therefore, Reason R is correct.
Relationship Between Assertion A and Reason R
Both Assertion A and Reason R are factually correct statements.
- However, Reason R (that mitochondria contain DNA) does not explain why a father cannot transmit a mitochondrial gene defect.
- The reason for the lack of paternal transmission is the specific maternal inheritance pattern of mitochondria, not merely the presence of DNA within them.
Consequently, while both statements are true, Reason R is not the correct explanation for Assertion A.
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