Zoology - Principles of Inheritance and Variation Question with Solution | TestHub

​An extranuclear inheritance or cytoplasmic inheritance is the transmission of genes that occur outside the nucleus. It is found in most eukaryotes and is commonly known to occur in cytoplasmic organelles such as mitochondria and chloroplasts or from cellular parasites like viruses or bacteria. Genes present in the cytoplasm are called cytoplasmic genes and are present in organelles like mitochondria and chloroplast. During sexual reproduction, only female gametes contribute cytoplasmic genes thus they show maternal inheritance and are inherited only by female gamete or egg cell.