Definitions

from The American Heritage® Dictionary of the English Language, 4th Edition

  • n. The hybrid of parents that differ at only two gene loci, for which each parent is homozygous with different alleles.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. A hybrid that is heterozygous with respect to two independent alleles

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • n. a hybrid produced by parents that differ only at two gene loci that have two alleles each

Etymologies

Sorry, no etymologies found.

Examples

  • Genetics Question: If the Phenotypic Ratio for the cross betweeen two dihybrid organisms for the F2 generation? is 9: 3: 3: 1, what are the genotypes of the parents?

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  • Recall that unlinked mutations will segregate independently (your basic dihybrid inheritance as first observed by Gregor Mendel) whereas linked mutations will not.

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  • However, Chi square tests for linkage are performed from a test cross (1: 1: 1: 1) rather than ratios from the dihybrid cross (9: 3: 3: 1 ratio) we did, so we can't use that statistical tool this time.

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  • Mendel's dihybrid crosses test the hypothesis that a. the heredity material for a single trait has 4 alleles

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