Question

A cross is made between homozygous fruit flies that differ for eye color (the st gene)...

A cross is made between homozygous fruit flies that differ for eye color (the st gene) and body color (the e gene). The F1 double heterozygote is shown below using chromosome notation. st+ e / st e+ st = the recessive allele for scarlet eyes; st+ = the dominant wildtype allele for red eyes e = the recessive allele for ebony body; e+ is the dominant wildtype allele for gray body.Are the chromosomes shown in the genotype above in cis or trans configuration? Based on this notation, what were the genotypes and phenotypes of the two parents of the F1?

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Answer #1

st+ e / st e+ -----Trans configuration

The parents of F1 are as follows

st+ e / st+ e (parent 1- red eyes, ebony body) x st e+ / st e+ (parent 2-scarlet eyes & gray body)---P1

st+ e st e+ -------------------gametes

st+ e / st e+ (red eyes, gray body)----F1

Explanation:

Both dominant allele of two genes are present on one chromosome and both recessive alleles are on another chromosome is cis configuration, st+ e+ / st e.

Dominant allele of one gene and recessive allele of another gene are present on one chromosome is called trans configuration.

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