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What is true breeding?

Genetics as it applies to evolution, molecular biology, and medical aspects.

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What is true breeding?

Postby MissionCO » Sun May 06, 2012 8:50 am

Hi,

I am a little confused what true breeding is.

Is it something like this: RR x RR or RR x rr


Rr x Rr is a mono hybrid cross, and RrBb x RrBb is a dihybrid cross correct?
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Postby JackBean » Sun May 06, 2012 9:15 am

True breeding means that all offspring has the same phenotype as parents. This is possible only with homozygotes, i.e. RR × RR; rr × rr, but also RRbb × RRbb, rrBBFF × rrBBFF etc.
http://www.biolib.cz/en/main/

Cis or trans? That's what matters.
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Postby MissionCO » Sun May 06, 2012 8:02 pm

So my 1st example

RR x RR

or rr x rr this is true breeding?

Not RR x rr correct?

RR x rr would be a mono hybrid right?


Thank so much.
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Postby JackBean » Sun May 06, 2012 8:06 pm

I think that in definition of true breeding it says: when bred with itself", so it should always be the same genotype for both
http://www.biolib.cz/en/main/

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