In $Drosophila$, the allele for a normal grey body colour $G$ is dominant to ebony body $g$. The following table summarises the results of several crosses:
$S.No$CrossResult
$I.$ Strain $1 \times gg$All wild type
$II.$ Strain $2 \times gg$$1$ wild type $: 1$ ebony
$III.$ Strain $3 \times gg$All ebony
$IV.$ Strain $4 \times Gg$$3$ wild type $: 1$ ebony

Which strains both have the genotype $Gg$?

  • A
    $I$ and $III$
  • B
    $I$ and $IV$
  • C
    $II$ and $III$
  • D
    $II$ and $IV$

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