Test cross in plants of in Drosophila involves crossing

Test cross in plants of in Drosophila involves crossing
  1. between two genotypes with recessive trait
  2. between two $\mathrm{F}_1$ hybrids
  3. the $F_1$ hybrid with a double recessive genotype
  4. between two genotypes with dominant trait

Solution

When $\mathrm{F}_1$ hybrid is crossed with recessive parent then it is called test cross. It is also a back cross. Test cross is done to test whether the dominant parent is heterozygous or homozygous.

Asked in: NEET 2011 (Mains)

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