Drosophila That Are Homozygous for a Loss-Of-Function Mutation of Swallow

Drosophila that are homozygous for a loss-of-function mutation of swallow develop normally.If a male that is homozygous for this mutant allele mates with a female that is homozygous for the normal allele,offspring of both sexes develop normally and survive to adulthood.In the reciprocal cross,offspring die before completing early embryonic development because their heads do not develop normally.From this information,one can infer that swallow is most likely a

A) maternal effect gene.
B) Hox gene that acts as a transcription factor to influence the expression of many other genes.
C) segment polarity gene.
D) gap gene that responds to concentrations of a maternal effect gene like bicoid or nanos.
E) pair rule gene.

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