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STD 12 - 4. principal of inheritance and variation — BIOLOGY STD 12 Science — Question

Gujarat BoardEnglish MediumSTD 12 ScienceBIOLOGYSTD 12 - 4. principal of inheritance and variation1 Mark
MCQ
A test cross is carried out to
  • ✓
    determine the genotype of a plant at $F_2$
  • 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.
✓

Answer

Correct option: A.
determine the genotype of a plant at $F_2$
a
(a) : Test cross is performed to determine the genotype of $F_2$ plant. In a typical test cross an organism showing dominant phenotype and whose genotype is to bedetermined 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 analysed to predict the genotype of the test organism. Given ahead is an illustration of test cross:

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