70.
Explain how a test cross can be conducted to distinguish between a homozygous and heterozygous dominant genotype.
Test Cross. When an individual is crossed to recessive parent called test cross. The results can be easily analysed. If you follow the monohybrid cross where the F
1 is test crossed, a ratio of 1:1 will be obtained. On the same basis, you can work out that in a dihybrid case, the test cross ratio will be 1:1:1:1. Test cross can also be used for another purpose. You must have understood by now that the homo and heterozygous genotypes for dominant trait cannot be differentiated because they show the same phenotype. If we put them through a test cross, you will see that all homozygous dominant combinations will breed true but heterozygous genotypes will follow the segregation.
A test cross can be conducted to differentiate between a homozygous and heterozygous dominant genotype.
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