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 Cross Result
$I.$ 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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