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(D) To determine the genotype of the strains, we analyze the test cross results:$1.$ Strain $1 	imes gg$ results in all wild type $(G-)$. This indica

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$II$ and $IV$

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(D) To determine the genotype of the strains, we analyze the test cross results:$1.$ Strain $1 	imes gg$ results in all wild type $(G-)$. This indicates Strain $1$ must be homozygous dominant $(GG)$.$2.$ Strain $2 	imes gg$ results in $1$ wild type $(Gg)$ $: 1$ ebony $(gg)$. This is a test cross, indicating Strain $2$ is heterozygous $(Gg)$.$3.$ Strain $3 	imes gg$ results in all ebony $(gg)$. This indicates Strain $3$ must be homozygous recessive $(gg)$.$4.$ Strain $4 	imes Gg$ results in $3$ wild type $: 1$ ebony. This is a monohybrid cross between two heterozygotes $(Gg 	imes Gg)$, indicating Strain $4$ is heterozygous $(Gg)$.Therefore, both Strain $2$ and Strain $4$ have the genotype $Gg$.

$S.No$	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

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