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

Rajasthan BoardEnglish MediumSTD 12 ScienceBIOLOGYSTD 12 - 4. principal of inheritance and variation1 Mark
MCQ
Test cross in plants or in Drosophila involves crossing
  • A
    between two genotypes with recessive trait
  • B
    between two $F_1$ hybrids
  • ✓
    the $F_1$ hybrid with a double recessive genotype
  • D
    between two genotypes with dominant trait.
✓

Answer

Correct option: C.
the $F_1$ hybrid with a double recessive genotype
c
(c) : 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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