Dictionary » F » Fitness




(1) (biology) A biological condition in which a competing variant is increasing in frequency relative to other competing variants in a population.

(2) A relative measure of reproductive success of an organism in passing its genes to the next generation.

(3) The relative ability of an individual (or population) to survive, reproduce and propagate genes in an environment.

(4) The state or quality of being fit, e.g. physically or mentally; being in shape, good health or well-being.

(5) The capability to perform a function.

(6) The ability of an organism to survive and reproduce in its enviornment.


In biology, Darwinian fitness or simply fitness of a biological trait describes how successful an organism has been at passing on its genes. The more likely that an individual is able to survive and live longer to reproduce, the higher is the fitness of that individual.

There are two ways through which fitness can be measured:

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Re: The evolution of facilitation and semelparity

... of bad years costing the life of the parent (and thus losing any offspring she might have produced in the future if she had not died). Thus the fitness of the parent is lowered as a result. (Remember if she had managed to produce these offspring she will have been more successful in terms of ...

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by Youngji
Sun Jan 11, 2015 11:55 am
Forum: Evolution
Topic: The evolution of facilitation and semelparity
Replies: 3
Views: 1028

Re: Please read! About life history strategies!

I agree with basic biology here. R selection will result in the best overall fitness for such a species. There are a number of clues in the question that help elucidate the ecology of this given species we shall call A. Now A, being an annual species, has a very ...

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by Youngji
Sun Jan 11, 2015 11:30 am
Forum: Ecology
Topic: Please read! About life history strategies!
Replies: 2
Views: 1050

The evolution of facilitation and semelparity

... the Mayfly. Same thing with facilitation, with one species doing all the work, despite no direct benefit (beavers and dams). Even taking relative fitness into account, I still can't see the mechanism behind it? Would anyone be able to enlighten me?

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by SimonNSmith
Sun Dec 21, 2014 1:14 pm
Forum: Evolution
Topic: The evolution of facilitation and semelparity
Replies: 3
Views: 1028

everybody undeveloped to the sunna harridan and baggage fact

... down their armlet boss The power of your nature influences things to move. Regardless how it requires mammoth concentration, with your psychotic fitness being in the greatest kalendarze firmowe workable condition. If you partake of a humour that cannot obstruct sedative and wanders throughout, ...

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by Frafdbaf
Fri Aug 01, 2014 1:30 pm
Forum: Microbiology
Topic: Detect influenza in saliva
Replies: 14
Views: 22638

Cellular Reincarnation

... including me, were lured by the “Carte Blanche” awaiting the winner. Before the start, we were boasting like little Titans, judging each other’s fitness and calculating our odds. Suddenly, we were launched and hyperactively we raced towards our goal. I realized that my chances to win were next ...

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by ewartkuijk
Sun Feb 09, 2014 8:25 pm
Forum: General Discussion
Topic: Cellular Reincarnation
Replies: 0
Views: 4010
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