Linked Questions

4
votes
2answers
9k views

What are the major causes of mutations in DNA?

I know that point mutations can change the base sequence of a gene by altering a specific codon that codes for a particular amino acid. Are these mutations purely random events that occur when DNA is ...
7
votes
5answers
960 views

How does Darwinian Evolution work?

Let me explain... A friend and I read some articles, part of a Biology book, and watched a video on evolution. We then tried to explain what Evolution is to each other. My friend said that Natural ...
4
votes
3answers
1k views

Are evolutionary mutations spontaneous?

My question is whether mutations which lead to evolution occur by any environmental force or it occur spontaneously? I have read in genetics that x-rays, ultraviolet rays and chemical mutagens are the ...
10
votes
3answers
1k views

What is the definition of a mutation?

There are two alleles that determine the sensitivity of a person to Coumadin (a medicine for blood thinners used to treat a stroke etc). Sometimes you encounter the terminology that one has a mutation ...
5
votes
3answers
596 views

Are the changes required to produce genetically manipulated organisms (GMOS) considered to be mutations

By definition, are mutations required to be natural, or are synthetic lab-induced genetic changes considered mutations too? Furthermore, are genetically manipulated organisms (GMOs) considered forced ...
4
votes
1answer
813 views

Effect of mutation on phenotype

Is there a type of mutation that changes the phenotype of an organism, but not the protein sequence?
4
votes
3answers
272 views

(Reference request) Formal abstract theory of evolution? [closed]

EDIT: please feel free to suggest books that are the closest you can come up with to what I'm looking for, even if it doesn't exactly overlap! I am very well acquainted with the theory of evolution ...
5
votes
2answers
410 views

Randomness in living systems

The point of my question is not to talk about events that are uncontrolled by living organisms. My question is about controlled randomness, or I'd like to say adaptive random process. Process that are ...
10
votes
1answer
193 views

Gender and age-specific mutation rate in plants

Background General concept According to Cochran and Harpending (2013), mothers transmits on average a number $x$ of new mutations to their offspring. This number $x$ is independent of the age of the ...
0
votes
3answers
280 views

Does evolution produce organisms perfectly adapted to their environment? [closed]

I have this biology assignment with this chosen topic. I have no idea where to start researching. I have studied the mechanisms and theories of evolution. I just don't know which relates to the topic. ...
3
votes
2answers
410 views

How can just random mutations explain mimicry? [closed]

I have been reading this article on drug resistance which explained that how random mutations in a bacterial colony can lead to development of drug resistance among some organisms in that colony. A ...
1
vote
2answers
179 views

Junk DNA and “random” mutations [closed]

I'm somewhat irritated by "mutation" generally being described as a fully random factor in evolution: pure randomness does not seem like something that can survive in a long evolutionary process. And ...
4
votes
2answers
143 views

Can mutation rate be selected for?

Can the mutability of DNA be selected for in a population? I don’t mean selection for the phenotype that is the result of a mutation. Rather, can the rate of mutations in a population be increased by ...
-1
votes
1answer
95 views

Can the environment affect genes and adaptation in offspring?

I recently read several articles that believe that environment can affect gene expression and this change will transfer down to the children. Some theorists believe that random mutations are more rare ...
2
votes
1answer
61 views

Cell-level selection and inheritance of acquired mutations

I was reading about different levels of selection in Ridley's Evolution textbook (chapter on units of evolution) and saw that some organisms e.g. carrots are not Weismannist i.e. don't have separate ...

15 30 50 per page