If a gray fly is crossed with a heterozygous black fly, which combination below represents the parental cross?

hello your question lacks the required options hence I will give you a  general answer

answer :  gg ( gray fly )  * Gg ( heterozygous black fly )

Explanation:

Let black body ( G ) be the dominant allele to gray body ( g )

hence the possible combination that will represent a parental cross when a gray fly is crossed with a heterozygous Black fly will be

gg ( gray fly )  * Gg ( heterozygous black fly )

it is called the mitotic spindle