Final answer:
All F1 progeny from the cross between a male fruit fly with dominant traits for wing shape and body color and a female fly with recessive traits for these features will be heterozygous for both traits. Since there is no crossing over, 100% of F1 flies will have heterozygous genotypes at both gene loci.
Step-by-step explanation:
The question is asking about a genetic cross between fruit flies with specific traits for wing shape and body color. In Drosophila, the normal wing shape is a dominant trait, while dumpy wings are recessive. Similarly, tan body color is dominant over ebony body color, which is recessive. When a male fly that is homozygous dominant for both traits (normal wings and tan body) is crossed with a female fly that is homozygous recessive for both traits (dumpy wings and ebony body), all F1 progeny will be heterozygous at both gene loci, since they receive one dominant allele from the male parent and one recessive allele from the female parent for each trait.
No crossing over between these gene loci is assumed, meaning the traits are inherited together. Therefore, 100% of the F1 flies will have the genotype 'Nntt', where 'N' is the dominant allele for normal wings, 'n' is the recessive allele for dumpy wings, 't' is the dominant allele for tan body color, and 't' is the recessive allele for ebony body color. Since all F1 progeny receive a 'Nt' chromosome from the homozygous dominant parent and a 'nt' chromosome from the homozygous recessive parent, they are all heterozygous at both loci.