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One of the autosomal loci controlling eye color in fruit flies has two alleles, one for brown eyes and the other for red eyes. Fruit flies from a true-breeding line with brown eyes were crossed with flies from a true-breeding line with red eyes. The F₁ flies had red eyes. What conclusion can be drawn from this experiment? (a) these alleles underwent independent assortment (b) these alleles underwent segregation (c) these genes are X-linked (d) the allele for red eyes is dominant to the allele for brown eyes (e) all of the preceding are true

User Hossam
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Final answer:

From this experiment, where true-breeding fruit flies with brown and red eyes produced all F1 offspring with red eyes, we can conclude that the red eye color allele is dominant to the brown eye allele.

Step-by-step explanation:

The experiment in question involved the crossing of fruit flies from true-breeding lines with brown eyes and red eyes. The F1 generation had red eyes, which allows us to conclude that the allele for red eyes is dominant over the allele for brown eyes. This is because in the presence of a dominant allele, the trait expressed by the dominant allele will be manifested in the heterozygote offspring, which is exactly what was observed in the F1 flies.

It is important to note, however, that this determination is based solely on the information given in the question. In general, eye color in Drosophila melanogaster can be an X-linked trait. But because the question specifically states that the locus is autosomal, and since we do not have any information indicating that these alleles underwent independent assortment or that the gene is X-linked, the correct conclusion is that the allele for red eyes is dominant to the allele for brown eyes.

User Dotnix
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7 votes

Final answer:

The conclusion that can be drawn from this experiment is that the allele for red eyes is dominant to the allele for brown eyes.

Step-by-step explanation:

The conclusion that can be drawn from this experiment is that the allele for red eyes is dominant to the allele for brown eyes. When true-breeding flies with brown eyes (RR) are crossed with true-breeding flies with red eyes (rr), all of the F₁ flies have red eyes. This indicates that the presence of the red eye allele masks the expression of the brown eye allele, making it recessive.

User Frozen Crayon
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