Cytoplasmic inheritance – mitochondrial genes, shell coiling, kappa particles - Question Bank
1. The study of mitochondrial genes is crucial for understanding human diseases related to:
2. Which cellular component contains the genetic material responsible for cytoplasmic inheritance, excluding mitochondria?
3. The 'killer' phenotype in *Paramecium* is an example of a trait determined by cytoplasmic factors that are themselves dependent on nuclear genes for their replication and maintenance. This demonstrates:
4. The genetic information within mitochondria is transcribed and translated:
5. If a mutation occurs in the mitochondrial DNA of a sperm cell, what is the likelihood of it being passed to the offspring?
6. Which of the following is a key characteristic of cytoplasmic inheritance that distinguishes it from nuclear inheritance?
7. The inheritance of shell coiling in *Limnaea peregra* is determined by the genotype of the mother, and this determination occurs during:
8. A mutation in a mitochondrial gene that affects ATP production would most likely impact which cellular process?
9. The genes present in mitochondria are believed to have originated from:
10. What role do kappa particles play in the ecology of *Paramecium* populations?
11. The size of the mitochondrial genome compared to the nuclear genome is:
12. Which of the following terms describes the influence of the maternal genotype on the offspring's phenotype, where the genotype of the mother determines the phenotype of the offspring, not the offspring's own genotype?
13. If a *Paramecium* possessing kappa particles mates with a *Paramecium* lacking them, what is the typical outcome for the F1 generation if the mating type allows cytoplasmic exchange?
14. The phenomenon of shell coiling in *Limnaea* is a classic example used to demonstrate:
15. The genes responsible for the synthesis of some subunits of the electron transport chain are found in:
16. Which type of inheritance involves factors located in the cytoplasm, often originating from the egg cell?
17. If a *Paramecium* that is homozygous for a nuclear gene required for kappa particle maintenance is crossed with one that lacks kappa particles, and the resulting F1 generation contains kappa particles, this indicates:
18. In *Limnaea peregra*, the genotype 'ss' leads to sinistral coiling only if the mother's genotype is 'ss'. This is an example of:
19. The maternal inheritance of mitochondrial diseases means that a mother with such a disease is likely to pass it on to:
20. The genetic material within kappa particles is similar in structure to:
21. Which of the following is NOT a characteristic of mitochondrial DNA?
22. The study of cytoplasmic inheritance helps explain phenomena where traits are passed down through generations in a manner that deviates from Mendelian ratios, often involving:
23. What happens to a *Paramecium* that loses its kappa particles (becomes 'non-killer')?
24. In *Paramecium*, the presence of kappa particles is maintained by a symbiotic relationship with:
25. A key feature of cytoplasmic inheritance is that it often bypasses the normal chromosomal segregation during:
26. The genes for ribosomal RNA and transfer RNA found within mitochondria are essential for:
27. Which cellular process is directly dependent on the genes encoded within mitochondrial DNA?
28. The characteristic of cytoplasmic inheritance is that it does NOT follow the typical patterns of Mendelian segregation and independent assortment because:
29. Which of the following describes the genetic material of kappa particles?
30. If the F1 offspring from the cross in question 19 (genotype Ss) are interbred, what is the expected phenotypic ratio in the F2 generation?
31. In the context of *Limnaea peregra* shell coiling, if a sinistral (ss) female (whose genotype is ss) mates with a dextral (SS) male, what will be the coiling of the F1 offspring?
32. The presence of kappa particles in *Paramecium* makes the cytoplasm of the host cell:
33. Kappa particles are obligate intracellular parasites of:
34. The small, circular genome of mitochondria is called:
35. Which of the following human genetic disorders is known to be caused by mutations in mitochondrial DNA?
36. The inheritance of traits encoded by mitochondrial DNA is independent of:
37. What is the genetic basis for the maternal effect on shell coiling in *Limnaea peregra*?
38. If the F1 generation from the cross in question 10 (dextral mother x sinistral father) are interbred, what is the expected phenotypic ratio of the F2 generation in terms of coiling?
39. The genotype responsible for sinistral coiling in *Limnaea peregra* is recessive (ss), while dextral is dominant (SS or Ss). However, the phenotype is determined by the maternal genotype. This illustrates:
40. In *Limnaea peregra*, a dextral (right-coiling) snail is crossed with a sinistral (left-coiling) snail. If the dextral snail is the mother, what is the coiling direction of the F1 generation?
41. Shell coiling in the snail *Limnaea peregra* is a classic example of cytoplasmic inheritance. The direction of coiling is determined by:
42. Which of the following is a characteristic of mitochondrial genes in eukaryotes?
43. The 'killer' trait in *Paramecium* strains possessing kappa particles is due to the production of a toxin called:
44. Kappa particles in *Paramecium* are dependent on nuclear genes for their maintenance and replication. This is an example of:
45. What phenomenon in *Paramecium aurelia* involves extranuclear genetic elements that determine the presence of 'killer' characteristics?
46. The inheritance pattern of mitochondrial genes is often referred to as:
47. Mitochondrial DNA (mtDNA) is typically inherited from which parent in most animal species?
48. Which organelle in eukaryotic cells contains its own DNA and ribosomes, enabling it to synthesize some of its own proteins?
49. What type of inheritance is primarily associated with genes located in the mitochondria?