The purpose of this lab is to understand how each offspring inherits its genotype and how its phenotype reflects it. Sex chromosomes determine the sex of the offspring, and the autosomes consist of all the other chromosomes that determine phenotypic traits. Dominant traits are the genes that are expressed, while the recessive traits are masked by the dominant traits. We used Drosophila melanogaster (fruit fly), mutating the female fruit fly with a scalloped gene to change the phenotype of its offspring and using males with genes showing wild-type. Placing WT males and SD females in the same vile, we provided the flies an atmosphere to mate, giving us offspring with mixed genotypes and phenotypes. This experiment will reflect the breeding of fruit flies and how genes are present within adults as well as passed down through the offspring. Our four hypotheses related to mode of inheritance that was used to pass the gene. The mode of inheritance for the scalloped gene is autosomal dominant. The genotype of the female parent is homozygous dominant. The male parent genotype is homozygous recessive. From this hypothesis we expect all of the offspring to have a heterozygous genotype, and the offspring would all be scalloped…. The mode of inheritance for the scalloped gene is autosomal recessive. The genotype of the female parent is homozygous recessive. The genotype of the male parent is homozygous dominant. From the hypothesis we can expect the offspring to have heterozygous genotypes, but the offspring’s phenotype would be wild type…. The mode of inheritance for the scalloped gene is sex-linked dominant. The genotype of the female is homozygous dominant. The genotype of the male parent is hemizygous recessive. From this hypothesis we can expect all the female offspring to be heterozygous and all the male offspring to be hemizygous dominant. Both male and female offspring would be scalloped….. Finally, the mode of inheritance for the scalloped gene is...
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