Testcross

Quick meaning: Testcross is a noun meaning (genetics) To breed an individual in this manner.

Meaning

(genetics) To breed an individual in this manner.

More Meanings

1. (genetics) The breeding of an individual with a phenotypically recessive individual, in order to determine the zygosity of the former by analysing proportions of offspring phenotypes.

Example Sentences

The inbreds of groups 3 and 4 have a distinct difference in plant height, except for a few selections, presumably because of some difference in selection pressure at low- and high-stand densities. Group means for testcross performance showed more progress in group 4 than in group 3 because of a difference in the number of low-yielding genotypes in the two groups.

You could determine its genotype by performing a testcross. If the plant were homozygous (TT), a testcross would produce all tall progeny (TT × tt → all Tt); if the plant were heterozygous (Tt), half of the progeny would be tall and half would be short (Tt × tt → 1/2 Tt and 1/2 tt). When a testcross is performed, any recessive allele in the unknown genotype is expressed in the progeny, because it will be paired with a recessive allele from the homozygous recessive parent.

Word Forms

• testcrosses
• test cross
• testcrossing
• testcrossed

Related Words

Related dictionary entries include progeny, cross, outcrosser, tetratype, crossability, linebreeding.

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