Biology Forum › Genetics › diheterozygous and dihomozyous

last updated by Khaiy 18 years, 8 months ago
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    • April 21, 2006 at 1:51 pm #4544
      tropical_shark
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      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

    • April 21, 2006 at 4:42 pm #46988
      Khaiy
      Participant

      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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