diheterozygous and dihomozyous

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tropical_shark
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diheterozygous and dihomozyous

Post by tropical_shark » Fri Apr 21, 2006 1:51 pm

Hi i was wondering if someone could give me a definition of diheterozygous and dihomozygous within a dihybrid cross. i no that heterozygous means different alleles and homozygous means the same alleles but i keep getting confused with the di in front
Thanks

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Khaiy
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Post by Khaiy » Fri Apr 21, 2006 4:42 pm

In a dihybrid cross, you're looking at the inheritence of two genes. For example, let's say that the genes are A and B. You know that a heterozygote for one gene is Aa or Bb, and all that the "di" in front means is that both genes are heterozygous, or that both genes are homozygous (for a diheterozygote and a dihomozygote, respectively). So a diheterozygote in my example would be AaBb. A dihomozygote would be AABB or aabb.

I've heard diheterozygotes referred to as dihybrids much much more often, so if you hear that phrase it's equivalent.

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