1. Tardigrade
  2. Question
  3. Biology
  4. In Drosophila, the allele for normal grey body colour (G) is dominant to the ebony body (g). The following table summarises the results of several crosses: Cross Result Strain 1 × gg All Grey type Strain 2 × gg 1 Grey: 1 ebony Strain 3 × gg All ebony type Strain 4 × Gg 3 Grey: 1 ebony Which strains have the genotype Gg ?

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Q. In Drosophila, the allele for normal grey body colour (G) is dominant to the ebony body (g). The following table summarises the results of several crosses:
Cross Result
Strain 1 × gg All Grey type
Strain 2 × gg 1 Grey : 1 ebony
Strain 3 × gg All ebony type
Strain 4 × Gg 3 Grey : 1 ebony
Which strains have the genotype Gg ?

NTA AbhyasNTA Abhyas 2022

Solution:

Strain 2 and 4 have the genotype Gg where grey body colour (G) is dominant to the ebony body colour (g). (Strain 2 × gg = Gg : gg = 1:1, and Strain 4 × Gg = GG : Gg : gg = 1:2:1).
Strain 1 will have genotype GG and Strain 3 will have genotype gg.