Question

Extranuclear inheritance is due to presence of genes in

• A. Mitochondria and chloroplasts
• B. Nucleus and mitochondria
• C. Nucleus and chloroplasts
• D. Endoplasmic reticulum and mitochondria

Answer 1

The correct option is A Mitochondria and chloroplasts

Chloroplasts and mitochondria are semi-autonomous cell-organelles possessing their own DNA and proteins. In animals an individual gets mitochondria and mitochondrial genes from its mother because the middle piece of a sperm that contains mitochondria does not enter the egg during fertilisation. This inheritance pattern of mitochondrial genes is called uniparental inheritance or extra nuclear inheritance or maternal inheritance. So, the correct answer is 'Mitochondria and chloroplasts'.