Question
Biology Question on Principles of Inheritance and Variation
Extranuclear genes occurs in
A
plastids and are not inherited
B
plasmid and are not inherited
C
mitochondria and are inherited by female
D
mitochondria and are inherited by male
Answer
mitochondria and are inherited by female
Explanation
Solution
Cytoplasmic inheritance or non chromosomal (extranuclear) inheritance is the passage of traits from parents to offspring through structures present inside cytoplasm of contributing gametes. The genes controlling cytoplasmic inheritance are called plasma genes or extra nuclear genes. These occur in plastids, mitochondria, plasmids. Cytoplasmic inheritance is usually uniparental. It is also called maternal inheritance as zygote receives its cytoplasm from ovum.