One of the parents of a cross has a mutation in its mitochondria. In that cross, that parent is taken as a male. During segregation of F2 progenies that mutation is found in:
Correct answer: B. None of the progenies
- A. One-third of the progenies
- B. None of the progenies
- C. All the progenies
- D. Fifty percent of the progenies
Explanation
When one of the parents in a cross has a mutation in its mitochondria and is considered the male, the mutation is usually found in none of the progenies (option b). This is because mitochondrial DNA is typically inherited maternally, and the male's mitochondrial DNA does not contribute to the offspring.
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About Inheritance
Mendel's laws explain segregation, independent assortment and the prediction of genetic ratios using alleles, genotypes and phenotypes. The chapter also covers linked genes, recombination and crossing over during meiosis, then applies pedigree reasoning to X-linked recessive traits, which show different inheritance patterns in males and females.
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