The brown body colour of a drosophila fruit fly is dominant to black body colour and is not sex-linked.Explain how Gregor Mendel could have used a brown drosophila fruit fly and a black drosophila fruit fly to show that brown body colour is dominant to black body colour – 10015

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1. To find out how body colour is inherited in fruit flies, I would first cross a brown-bodied fruit fly with a black-bodied fruit fly. Then I would observe the offspring and record what body colour they have.

   If all the offspring have brown bodies, that shows the brown body allele is dominant over the black one. The first generation are all heterozygous (Bb), where B is the dominant brown allele and b is the recessive black allele.

   Next, I would remove the parent flies so they don’t breed again. Then I would cross two of the brown-bodied offspring from the first generation with each other.

   In the second generation, I would look at the phenotypes (the visible characteristics) of the new offspring. According to Mendelian inheritance, 1/4 of the offspring should have black bodies, and 3/4 should have brown bodies.

   This would show a classic 3:1 ratio like Mendel found in his pea plant experiments. It proves that body colour is controlled by a pair of alleles where brown is dominant and black is recessive.

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