Dihybrid cross/Test cross/Trihybrid cross ???

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09MillerLr
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Dihybrid cross/Test cross/Trihybrid cross ???

Post by 09MillerLr » Wed Mar 01, 2006 11:04 pm

Hey i am having trouble understanding this,my teacher isn't telling us the way i would understand this. DOES ANYONE KNOW WHAT ALL OF THE CROSSES MEAN... :D

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Khaiy
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Post by Khaiy » Wed Mar 01, 2006 11:19 pm

I do. Here's what you need to know about each.

A dihybrid cross is a two gene problem, in which each parent is a heterozygous for each gene. An example would be:
AaBb crossed with another AaBb individual. So you have a two gene cross, and each parent has both alleles for each gene.

A test cross means crossing a generation (usually the F1 generation, or the first offspring generation) is bred with an individual who's genotype is known. The way that this is generally done is the F1 individual is crossed with a homozygous recessive, since the genotype can be guaranteed based on the phenotype observed.

A trihybrid cross is the same dihybrid cross, except it's a three gene problem rather than two. Everything else will still be the same. An example would be AaBbCc crossed with another AaBbCc individual.

I hope that this answered your question, if you have any more just post them or PM me!

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