Test cross in plants or in Drosophila involves crossing:
Correct answer: C. The F 1 hybrid with a double recessive genotype
- A. Between two genotypes with recessive trait
- B. Between two F1 hybrids
- C. The F 1 hybrid with a double recessive genotype
- D. Between two genotypes with dominant trait
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 below 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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