genetic variation within a population

nevada

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12 years ago

hello, i am reading the Campbell bio. book and i am having trouble understanding these concept in chapter 23.

-genetic variation within a population, i dont understand what they are trying to say

"quantitative characters which vary along a continuum within a population.
heritable quantitative variation usually results from the influence of two or more genes on a single phenotypic character."

thanks.

Source Campbell biology 9th ed.

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nickelbell54

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12 years ago

Which section?

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duddy

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Staff Member

12 years ago

Quote from: nevada (12 years ago)

"quantitative characters which vary along a continuum within a population.heritable quantitative variation usually results from the influence of two or more genes on a single phenotypic character."

In certain cases, two or more genes are responsible for creating a particular phenotype. For instance, skin colour is determined by a barrage of seven or more genes. For instance, not one gene is responsible for your skin colour.

Does that help?

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Sec. .

wrote...

12 years ago

Quote from: nickelbell54 (12 years ago)

Which section?

It's sec. 23.1 page. 470 "variation within a population"
I'm pretty much confuse as to wht they are trying to say in that whole area about quantitative characters.

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nevada Author

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12 years ago

Quote from: duddy (12 years ago)

Quote from: nevada (12 years ago)

"quantitative characters which vary along a continuum within a population.heritable quantitative variation usually results from the influence of two or more genes on a single phenotypic character."

So its like when 2 or more genes is the reason that a person skin maybe light or dark, not just one where as there is only one gene that makes a flower either blue or pink? Is that the right idea I'm getting

What do they mean with " most heritable variation involves quantitive characters".

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