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Drosophila Genetics Lab Report

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Abstract

The purpose of this lab is to choose a complex set of traits of Drosophila melanogaster and breed them to evaluate the phenotypes of the offspring created. There was an F1 cross of males and females with different traits and we evaluated their offspring (F2 generation.) The class was given the option of choosing simple autosomal or sex-linked patterns. This lab was performed following the procedure in the College Boards AP Formal Lab #7: Drosophila Genetics. Our results for the breeding were a phenotypic ratio of 9:3:3:1. Nine being normal eyes and normal wings, 3 being normal eyes and vestigial wings, other three being normal eyes and vestigial wings, and one being sepia eyes and vestigial wings.

Keywords: Inheritance, autosomal, …show more content…

There are three laws of inheritance, according to Gregor Mendel (Updegraff, 2017.) The first law of inheritance is the law of dominance (Updegraff, 2017.) If a traits appearance is always visible in offspring, it is a dominant trait (Updegraff, 2017.) This means that dominance describes the association that occurs between two alleles (Updegraff, 2017.) This means that regardless of the allele combination that is given to the offspring, the dominant allele will always be seen over a recessive trait (Updegraff, 2017.) The second law of inheritance is the law of segregation (Updegraff, 2017.) Mendel's second law, The law of segregation states that two distinct alleles for a specific gene, who are on different copies of a chromosome, will be separated during meiosis (Updegraff, 2017.) The third law of inheritance is the law of independent assortment (Updegraff, 2017.) The law of independent assortment states that regardless of how an allele pair is isolated into two daughter cells while in the second division of meiosis, there is no change to how all other allele pairs get isolated (Updegraff, 2017.) To specify, traits inherited by one gene are independent to the traits inherited by other gene (Updegraff, 2017.) This is because the different chromosomes that the genres are on are independently assorted into daughter cells during meiosis (Updegraff, …show more content…

The P phenotypes and F1 phenotypes were the same. Once the breeding begins, there will be four combinations created. Some will have normal eyes and normal wings, other will have normal eyes and vestigial wings, others will have sepia eyes and normal wings, and others will have sepia eyes and vestigial wings.

Discussion of results

Mendel used a different approach to to solve the complexity of patterns of inheritance

First, it’s the monohybrid cross. This cross shows how a trait is published from generation to generation. Next, we have Mendel's dihybrid cross. This cross helped to prove one o his most historic discovery, independent assortment. In addition, The trihybrid cross demonstrates how Mendel's concepts can work with the inheritance of many traits. Laws of probability also helped to explain genetic events that were occuring. The chi-square analysis assesses the influence of chance on genetic data. Lastly, pedigree show repeating patterns of inheritance in homosapiens.

(chi square analysis is used to explain the inheritance pattern seen in the genetic cross.

(purpose of calculation)

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