American Heritage® Dictionary of the English Language, Fourth Edition
- n. The hybrid of parents that differ at only two gene loci, for which each parent is homozygous with different alleles.
- n. a hybrid produced by parents that differ only at two gene loci that have two alleles each
“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?”
“Recall that unlinked mutations will segregate independently (your basic dihybrid inheritance as first observed by Gregor Mendel) whereas linked mutations will not.”
“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.”
“Mendel's dihybrid crosses test the hypothesis that a. the heredity material for a single trait has 4 alleles”
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