What observations are consistent with the conclusion that DNA ...

Question

What observations are consistent with the conclusion that DNA serves as the genetic material in eukaryotes? List and discuss them.

Accepted Answer

Hi everyone. Welcome back. Let's look at our next question which of the following is considered an indirect proof that DNA. Is the genetic material and new carry outs. So early on in these days of research when um scientists were trying to figure out what was the genetic material in cells. The earliest proofs were considered indirect proofs rather than direct. So let's look at our answer choices noting that choice D. Is all of the above. So there is the possibility that all of these are indirect proofs choice A. Says D. N. A. Is found only where primary genetic functions occur. Um And this is true and was considered an indirect proof. So I'm gonna mark that is correct. Um D. N. A. Is found only in the nucleus mitochondria and chloroplasts. And that led scientists they were going back and forth. Was it D. N. A. Or was it proteins that carry the genetic material and proteins found in the cytoplasm all over compared to D. N. A. Only where you saw those primary genetic functions occurring um considered indirect proof that D. N. A. Was the genetic material versus proteins. Then choice B says the amount of D. N. A. And the number of sets of chromosomes are closely correlated. And yes this was another indirect proof. Um The idea that the amount of DNA, the DNA content employee were related were proportional. So a deployed cell had twice as much DNA has a half load cell of the same species. So since we've already got two correct answers um we can go ahead if we wanna test we'd go ahead and select choice D. All of the above as our answer. But since we're being thorough here we'll look at that third answer choice, assuming it will be correct but we should walk through it anyway. Choice E. Says the absorption wavelength of D. N. A. Correlated with the wavelength of UV light that were found to be mutagenic. And again not a direct proof but definitely an indirect proof because it was seen that certain wavelengths of UV light were known to be mutagenic and it was observed that DNA absorbed that wavelength of UV light. So it makes sense that this wavelength of light absorbed by D. N. A. Affects DNA. Found to be mutagenic and cause changes in DNA. So again, our answer here, which of the following is considered an indirect proof that DNA is the genetic material. New carry outs choice D. All of the above. See you in the next video.

What observations are consistent with the conclusion that DNA serves as the genetic material in eukaryotes? List and discuss them.

Key Concepts

Griffith's Transformation Experiment

Avery-MacLeod-McCarty Experiment

Hershey-Chase Experiment

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