Homework Help: Benefits of variation?

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1. Dec 13, 2017

navneet9431

1. The problem statement, all variables and given/known data
Variation during reproduction is beneficial to the species but not necessarily for the individual?
2. Relevant equations
Not any
3. The attempt at a solution
I only know about variation during reproduction is beneficial to the species but I don't know anything about how it is not necessarily beneficial for individual.
I think it is beneficial for species because it helps the species of various organisms to survive and flourish even in adverse environment. For example if there is a population of certain bacteria living in temperate water (which is neither very hot no very cold) and the temperature of water increases too much due to global warming then most of these bacteria will not be able to tolerate excessive heat and hence die but some bacteria which had variations to resist heat would survive and grow further.

But,I do not know how it is not necessarily beneficial for individual?

Note:I am a high school student and English is my second language. Thanks!

2. Dec 13, 2017

BvU

Think of the poor bacteria in your story that had a variation to resist cold bett er than average. They died first !

3. Dec 25, 2017

BillTre

Asked about the statement:
This is a statement about genetic inheritance of factors affecting reproductive success in a breeding (evolutionarially successful) population. These would be the genetic factors, in a breeding population, selected for (at some time when genetic variation is needed), due to their position in some gradient of the genetic variation.

What you just described:
is a good example of the beneficial side of the statement:
The
part is just saying that, at some some times when variation in reproductive success, at a population level can be good for survival (and being positively selected for) will not work out for all sections of a reproductive population.

At some point, there will be winners and losers, perhaps resulting from a change in environment, as you suggested.
Some of those organisms, will not reproduce or may out right die (equivalent from an evolutionary point of view, not adding genetically, to the next generation).
From the point of view of an individual (in the genetically based losing part of the population), the effects of the changes (which population level genetic variation can overcome) will not be beneficial to all individuals with in the population. Some will be in the reproductively losing part of the population. They are the "not necessarily (beneficial) for the individual" part.

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