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Glossary Term
Glossary Term Testcross
Definition A type of cross in which individuals whose genotype with respect to one or more genes is unknown are crossed to a test strain homozygous for a recessive allele at the genes under study. For example, a cross of an individual that was A/A or A/a (identical in phenotype) to a/a would reveal the genotype of the individual being tested, because if the individual being tested were A/A, all of the progeny would show the dominant phenotype, while if the individual being tested were A/a, half of the progeny would show the dominant phenotype and half would show the recessive phenotype.
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Contributing Projects:
Mouse Genome Database (MGD), Gene Expression Database (GXD), Mouse Tumor Biology (MTB), Gene Ontology (GO), MouseCyc
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last database update
08/26/2014
MGI 5.19
The Jackson Laboratory