Heritable Traits Lab Report
Animal Development and Heritable Traits Lab Report
Introduction
Drosophila, or the fruit fly, is an ideal organism for many laboratory studies. It can easily be observed in a confined space and two flies can reproduce hundreds of offspring. The most important thing about studying fruit flies, however, is the ease with which inherited traits can be observed in them. Heritable traits are those that are expressed in organisms due to genes passed down to them by their parents. The genes can be carried on either the autosomes or the sex chromosomes. The traits themselves can be either dominant or recessive, and are referred to physically as phenotypes and genetically as genotypes. (Hurney, Pesce, Babcock 2005) If one cannot determine the genotype …show more content…
From this, we would be able to determine the genotypes of the parent generation and what type of mutation apterous would be. We made four hypotheses about this mutation. First, the mutant gene is transmitted to offspring as autosomal dominant. The resulting offspring of a cross between dominant apterous flies and recessive wild type flies is a completely apterous population with a genotype of Aa. Next, the mutant gene is transmitted as autosomal recessive. In this case, a cross between recessive apterous flies and dominant wild type flies results in a completely wild type population in the offspring with a genotype of Aa. Third, the mutant gene is transmitted as sex-linked dominant. This time, a cross between dominant apterous females and recessive wild type males results in an apterous offspring population with phenotypes of XAXa for females and XAY for males. Finally, the mutant gene is transmitted as sex-linked recessive. In this case, the genotype of the parent generation is XaXa for the females and XAY for the males. For a cross of recessive wild type females and dominate apterous males results in offspring of wild type females and apterous males with genotypes of XaXa for females and XaY for males. The …show more content…
We found that when the apterous females and wild type males were bred, they produced offspring that had 13 wild type females and 0 mutant females, and 16 wild type males and 0 mutant males. The reciprocal of our cross, which bred wild
Introduction
Drosophila, or the fruit fly, is an ideal organism for many laboratory studies. It can easily be observed in a confined space and two flies can reproduce hundreds of offspring. The most important thing about studying fruit flies, however, is the ease with which inherited traits can be observed in them. Heritable traits are those that are expressed in organisms due to genes passed down to them by their parents. The genes can be carried on either the autosomes or the sex chromosomes. The traits themselves can be either dominant or recessive, and are referred to physically as phenotypes and genetically as genotypes. (Hurney, Pesce, Babcock 2005) If one cannot determine the genotype …show more content…
From this, we would be able to determine the genotypes of the parent generation and what type of mutation apterous would be. We made four hypotheses about this mutation. First, the mutant gene is transmitted to offspring as autosomal dominant. The resulting offspring of a cross between dominant apterous flies and recessive wild type flies is a completely apterous population with a genotype of Aa. Next, the mutant gene is transmitted as autosomal recessive. In this case, a cross between recessive apterous flies and dominant wild type flies results in a completely wild type population in the offspring with a genotype of Aa. Third, the mutant gene is transmitted as sex-linked dominant. This time, a cross between dominant apterous females and recessive wild type males results in an apterous offspring population with phenotypes of XAXa for females and XAY for males. Finally, the mutant gene is transmitted as sex-linked recessive. In this case, the genotype of the parent generation is XaXa for the females and XAY for the males. For a cross of recessive wild type females and dominate apterous males results in offspring of wild type females and apterous males with genotypes of XaXa for females and XaY for males. The …show more content…
We found that when the apterous females and wild type males were bred, they produced offspring that had 13 wild type females and 0 mutant females, and 16 wild type males and 0 mutant males. The reciprocal of our cross, which bred wild