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Results tagged with dna
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user 19073
Deoxyribonucleic acid (DNA) is the carrier of genetic information, including for all known living organisms. The only known exceptions are RNA viruses.
1
vote
1
answer
531
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Why is the threshold between human embryo and human fetus defined as 8 weeks after fertiliza...
Why is the threshold between human embryo and human fetus defined as 8 weeks after fertilization? What's happening on the 8th week?
Note: definition of embryo based on Wikipedia's current definitio …
- 1,921
15
votes
8
answers
5k
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Is there a biological mechanism for evolution encoded into our DNA?
It seems plausible to me that we (advanced life) could have a biological mechanism to "write" needed alterations into either our own DNA or our reproductive DNA over time, triggering the very specific …
- 1,921
11
votes
4
answers
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How did the first life form on Earth reproduce without DNA?
How did the earliest life forms exist without DNA? … How did reproduction occur without DNA? Do scientists have a theory on how the first reproduction occurred? …
- 1,921