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Results tagged with evolution
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user 69
Changes in the heritable attributes of populations of organisms over time. The mechanisms of evolution are mutation, migration, drift, and selection.
12
votes
1
answer
1k
views
In which order did the cells of the immune system evolve?
Thinking about how complex the interactions between different types of immune system cells (T-helpers, T-Killers, Phagocytes, B-Cells etc.) are, it's fascinating how they all combine to get the desire …
- 7,680
2
votes
Is it possible to make bacteria vulnerable to antibiotics it's resistant to?
The other answers describe the situation well for an individual, however there have been cases in the past where antibiotic resistance has emerged and been outgunned by medical advances to overcome th …
- 13.5k
10
votes
1
answer
569
views
What advantage would the initial 'donor' in horizontal gene transfer by conjugation have rec...
I am struggling to think why horizontal gene transfer between bacteria would have persisted during the course of evolution as surely it puts the 'donor' at a disadvantage? …
- 3,224
26
votes
Why did the process of sleep evolve in many animals? What is its evolutionary advantage?
I found this paper by Benington and Heller that expands on the previously mentioned theory of sleep as a mechanism to renew metabolism. They hypothesise that sleep is necessary to replenish glycogen …
- 13.5k
6
votes
Did human hairs actually evolve from scales?
One theory displayed in "The evolution of mammalian keratinized structures" (abstract only) is that mammalian hair developed along the following pathway:
Hair follicles develop between reptilian like … "Some Speculations on the Evolution of the Vertebrate Integument" (Paul F. A. Maderson) suggests an entirely different origin of hairs. …
- 13.5k
6
votes
Why have humans evolved much more quickly than other animals?
The ability to walk on two legs was hugely significant in human evolutionary development. This led to the hands being freed up to develop into precision tools rather than having to be durable for walk …
- 13.5k
22
votes
Accepted
Why would stablising selection ever happen?
This leads to selective pressures in both directions, stabilising towards a mean birth weight as shown below:
This is an example of evolution not pushing a species forward but ensuring that individuals …
- 13.5k
34
votes
Why do plants have green leaves and not red?
I believe it is because of a trade off between absorbing a wide range of photons and not absorbing too much heat. Certainly this is a reason why leaves are not black - the enzymes in photosynthesis a …
- 13.5k