Test crossing

[MedPR]

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So AA with aa is called a monohybrid cross.

aa with Ax (x=unknown) is a test cross.

AaBb with aabb is a dihybrid cross.

What would Aa with Aa be called?

 

[chiddler]

I don't know but this doesn't seem very important. Why do you want to know?

 

[MedPR]

I don't know but this doesn't seem very important. Why do you want to know?

Did a TBR passage that asked some definitional questions like those.

 

[chiddler]

huh. well that sucks.

please tell me if you learn what it is.

 

[MedPwnage]

Aa with Aa is also a dihybrid cross

 

[MedChad]

I can help you with this one medpr after all of your help!
A monohybrid cross is one gene, so aa x bb. Doesn't matter If they are homozygous or hetero its just 1 gene, hence the mono.
A dihybrid cross is with two genes, so aabB x Aa Bb, once again it doesn't matter if they are hetero or homo, its just 2 genes crossing.
A test cross is usually whatever you want to test x with a heterozygous recessive. This way you can determine the genotype of the unknown since you know the homozygous recessive gene won't be expressed. So for example ?? x aa. Does that make sense?

 

[MedChad]

Sorry I meant homozygous recessive in

" A test cross is usually whatever you want to test x with a HOMOZYGOUS recessive"