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Question

Test cross in plants or in Drosophila involves
  1. Crossing the F1 hybrid with a double recessive genotype
  2. Crossing between two genotypes with dominant trait
  3. Crossing between two genotypes with recessive trait
  4. Crossing between two F1 hybrids

A
Crossing the F1 hybrid with a double recessive genotype
B
Crossing between two F1 hybrids
C
Crossing between two genotypes with dominant trait
D
Crossing between two genotypes with recessive trait
Solution
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T. H. Morgan performed his research on Drosophila melanogaster. It was thus given another name of "Biological Cindrella". Wild type (gray with normal wings) when crossed with double mutant (black with vestigial wings) gives F1 generation dihybrid - Gray with normal wings. F1 dihybrid when crossed with parent (double mutant - black with vestigial wings) called as test cross.

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