A test cross is carried out to:
Correct answer: A. Determine the genotype of a plant at F2
- A. Determine the genotype of a plant at F2
- B. Predict whether two traits are linked
- C. Assess the number of alleles of a gene
- D. Determine whether two species or varieties will breed successfully or not
Explanation
A test cross is performed to determine the genotype of the F2 plant. In a typical test cross, an organism showing dominant phenotype and whose genotype is to be determined is crossed with one that is homozygous recessive for the allele being investigated, instead of selfcrossing. The progenies of such a cross can easily be analyzed to predict the genotype of the test organism. Given ahead is an illustration of a test cross:
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About Inheritance
Mendel's laws explain segregation, independent assortment and the prediction of genetic ratios using alleles, genotypes and phenotypes. The chapter also covers linked genes, recombination and crossing over during meiosis, then applies pedigree reasoning to X-linked recessive traits, which show different inheritance patterns in males and females.
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