Payne, B. A. et al. (2013) present evidence that a low l...

Question

Payne, B. A. et al. (2013) present evidence that a low level of heteroplasmic mtDNA exists in all tested healthy individuals.

What are two likely sources of such heteroplasmy?

Accepted Answer

Hi everyone here's our next question. It says which of the following describes hetero plasma. Well let's recall what hydro plasma is whenever we have that prefix hetero meaning different and hetero plasma is the presence of more than one type of organ. Eller genome inside a cell or individual Can also mean the presence of more than one allele for a gene in a cell. So kind of on the ground. This means we think of organelles genomes. We think of mitochondria in uh animal cells containing their own mitochondrial D. N. A. And there can be hundreds of mitochondria in sl each with their own mitochondrial DNA. So hundreds of copies of mitochondrial DNA present in each cell. This is an advantage because, you know, mitochondria being that essential energy factory for the cell at birth. All the mitochondrial DNA is thought to be identical mutations arise in them over the course of a lifetime. But since you've got so many copies, the mutations only affect a small percent of the mitochondria, leaving the rest unaffected kind of being that protection of such an important organelles in the cell and in the presence of plastics and plant cells. Similarly multiple copies of the plastic genome. So let's look at our answer choices to rule out incorrect answers and find our correct answer, noting that we do have choice. D all options are correct. So we may have more than one correct answer choice A says a germ cell containing mutant and wild type mitochondria. Well this is correct. As we said, our mitochondria multiple many mitochondria with their own copies of mitochondrial DNA and some of those might carry mutations where some will be unaffected. Choice B says the mitochondria having more than one type of mitochondrial DNA. Again, this is correct because you can have different mutations arising in the mitochondrial DNA of different mitochondria. Finally, choice. See a cell having more than one alley for one gene. And yes, we talked about that being sort of an alternate meaning of hetero plasma. So here we find that all of our options are correct. So our answer here is Choice D All options are correct. See you in the next video.

Payne, B. A. et al. (2013) present evidence that a low level of heteroplasmic mtDNA exists in all tested healthy individuals.

What are two likely sources of such heteroplasmy?

Key Concepts

Mitochondrial DNA (mtDNA)

Heteroplasmy

Sources of Heteroplasmy

Watch next

Payne, B. A. et al. (2013) present evidence that a low level of heteroplasmic mtDNA exists in all tested healthy individuals.What are two likely sources of such heteroplasmy?

Key Concepts

Mitochondrial DNA (mtDNA)

Heteroplasmy

Sources of Heteroplasmy

Watch next

Payne, B. A. et al. (2013) present evidence that a low level of heteroplasmic mtDNA exists in all tested healthy individuals.

What are two likely sources of such heteroplasmy?