In Drosophila melanogaster the genes for grey body color and normal wings are dominant and locate on the same chromosome. The recessive alleles are for black body color and vestigial wings. The flies homozygous for grey body and normal wings were crossed with flies with the two recessive traits. What traits did the F1 flies have? The Phenotypic Expression of Drosophila melanogaster in a Recessive Cross: An Analysis

A Study of Drosophila Melanogaster’s Phenotypic Expression in a Recessive Strain:
Drosophila mylanogaster has dominant genes for normal and grey bodies. These genes are found on the same DNA chromosome. Recessive alleles can be found for vestigial wings and black body color. The F1 flies were created when flies homozygous to grey body and normal wings crossed with flies carrying the recessive traits. They had normal wings and grey bodies, and heterozygous alleles of both the body and wings (Chen and al., 2016). This is called the “dominant” genotype. The F1 flies had a body color and structure that was identical to the parents. F1 flies weren’t homozygous for dominant alleles. In fact, they were heterozygous as the gene for vestigial and black bodies had been transmitted from parents who carried the recessive genes. The F1 flies were able to pass either dominant or recessive genes on to their offspring (Liu and co., 2018). F2 fly would then have a ratio of phenotypic 3:1 for dominant traits. This means that F1 flies will have three F2 flies with normal wings and grey bodies, while F2 would have one F2 fly with vestigial wings and black body colors. Cont….
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