Definitions
from The American Heritage® Dictionary of the English Language, 5th Edition.
- noun The offspring of parents that are each homozygous for different alleles of two genetic loci.
from Wiktionary, Creative Commons Attribution/Share-Alike License.
- noun genetics A
hybrid that isheterozygous with respect to twoindependent alleles
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- noun a hybrid produced by parents that differ only at two gene loci that have two alleles each
Etymologies
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Examples
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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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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
fbharjo commented on the word dihybrid
How allelesous!
February 24, 2012