Cytoplasmic inheritance or extranuclear inheritance is the transmission of genes that occur outside the nucleus such as mitochondria and chloroplasts or from cellular parasites like viruses or bacteria. In mammals, cytoplasmic genes are only contributed by female gamete, e.g., Male gamete only contribute its nuclear genes. Thus, none progenies would not inherit any mutated genes in mitochondria by father. Related Theory The phenotypes that are controlled by nuclear factors found in the cytoplasm of the female are said to express a maternal effect. Those phenotypes controlled by organelle genes exhibit maternal inheritance. The classic phenotype which exhibits maternal effects is coiling direction of snail shells.
One of the parents of a cross has a mutation in its mitochondria. In that cross, that parent is taken as male. During segregation of F_2 progenies…
NEET UG 2004 — Zoology Principles of Inheritance and Variation
2004mcqmedium
One of the parents of a cross has a mutation in its mitochondria. In that cross, that parent is taken as male. During segregation of F2 progenies that mutation is found in:
Official previous-year question
Held on 30 Apr 2004 · Verified 9 Jul 2026.
Options
- A
one-third of the progenies
- B
none of the progenies
- C
all the progenies
- D
fifty percent of the progenies.
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