dihybrid

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di·hy·brid

(dī-hī'brid),
The offspring of parents differing in two characters.
[G. di-, two, + L. hybrida, offspring of a tame sow and a wild boar]

dihybrid

(dī-hī′brĭd)
n.
The offspring of parents that are each homozygous for different alleles of two genetic loci.

dihybrid

  1. an organism that carries two different ALLELES of one gene and two different alleles of another gene. For example, character A (controlled by alleles A 1 and A2) and character B (alleles B1 and B2 ). The dihybrid would have the genotype A1A2 B1B2, i.e. a double HETEROZYGOTE.
  2. (of a cross) having two parents that have been mated to produce dihybrids that are then also mated. A single dihybrid plant is self-fertilized (see SELF-FERTILIZATION). MENDEL formulated his law of INDEPENDENT ASSORTMENT from the results of a dihybrid cross involving pairs of contrasting characters in the pea plant.
References in periodicals archive ?
At this point, the dihybrid cross is essentially identical to a sample monohybrid cross, except with two traits.
As complicated as this dihybrid cross was, imagine such a cross with characters displaying incomplete dominance or a trihybrid cross (three nonlinked traits).
Two linked traits will not produce the typical 9:3:3:1 ratio in the F2 generation of a dihybrid cross (as previously discussed) because the genes are not subject to independent assortment during meiosis.
P POSITIVE x NEGATIVE F1 100% positive F2 351 positive:256 negative The 351:256 results more closely resemble a 9:7 ratio, which would indicate a modified 9:3:3:1 ratio of a dihybrid cross, indicating two pairs of genes.
Without epistasis, a 9:3:3:1 ratio of enzymes a and b/enzyme a only/enzyme b only/neither enzyme would be normal for a dihybrid cross in the F2 generation.
Students routinely generate and analyze for gene linkage the F2 generation of Drosophila dihybrid crosses using chi-square analysis but do not map the genes if they are determined to be linked (College Board, 2001; Mertens & Hammersmith, 2007; Scott, 2001).
Students are not told a priori which experiment they are conducting, only that they are analyzing the results of one of the three possible Mendelian dihybrid crosses. Their goal is to determine which traits in their experiment are being controlled by specific genes.