ipl-logo

Drosophila Genetics Lab Report

1581 Words7 Pages

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)

Show More
Related

Rock Pocket Mice Case Study

1080 Words | 5 Pages

Materials: 1. Genetic code chart 2. The Making of the Fittest: Natural Selection and Adaption Student Handout

Read More

Fruit Fly Lab Report

1422 Words | 6 Pages

Although these traits are not sex linked, the life cycle and sex determining markers for fruit flies was first identified and studied. The sex determining factors were used to differentiate the F 1 (male and female) before interbreeding the F1 generation. Using the observed traits of the parents, the genotypes of the F1 generation was derived. Using the observed phenotype and the derived genotype of the F1 generation, the phenotypic ratio of the F2 were hypothesized to be 9 winged and red , 3 wingless

Read More

Fruit Fly Lab Report

708 Words | 3 Pages

In this experiment Drosophila melanogaster (fruit fly) were used. To begin with the lab, four virgin females with mutant genotype for yellow body color, crossveinless, and forked bodies were mated with genotype (y cv v f / y cv v f). Then these females were crossed with six males with all wild-type genotypes, which can be abbreviated as (+ + + / Y). During the first week of experiment the flies were anesthetized and viewed under dissecting microscope. Then the flies with above characteristics were chosen.

Read More

Fruit Flies Lab Report

1727 Words | 7 Pages

The chi square table is shown in the results section as Table 2. A chi square test is an analysis test to see if the results of an experiment match the normal dihybrid ratio (9:3:3:1) that is being looked for. Our experiment was to observe unknown flies and based on their phenotypes, then try and discover the genotypes of the parental generation. We hypothesized that both parents were heterozygous making the ratio

Read More

The Blank Slate Chapter 3 Analysis

1353 Words | 6 Pages

The first of the three laws is simply, “all human behavioral traits are heritable.” Pinker discusses how behavioral traits are measured, typically through tests like the IQ test, and then the variance is calculated. The variance is the difference from one person compared to the average of the group as a whole. The variance tells how much people are different or similar to each other. Pinker then goes on to explain that heritability is the proportion of

Read More

How Did Gregor Mendel Have Blue Peas

504 Words | 3 Pages

Mendel had concluded that there had to be two kinds of factors dominant and recessive factors. In the first experiment (F1) the yellow was completely dominant and it seemed the green factor had gone away. But in the second experiment (F2) the green gene had reappeared in one of the four peas in the offspring so in the second experiment the three of four peas the yellow gene was dominant and the other pea had the green recessive

Read More

Gregor Mandel Influences

272 Words | 2 Pages

Gregor Mandel went through a very long process before discovering that plants had sexes, and the fundamentals of inheritance. Mandel had his own garden where he grew his peas and did his research. He was greatly influence by Joseph Koelreuter, by the way he thought about heredity. This inspiration allowed him to have the curiosity to further pursue his work. Mandel had three specific ideas that also influence his work, they were: That fertilizing the hybrid plants would seem to create a new species.

Read More

Differences Between Mitosis And Meiosis

870 Words | 4 Pages

His thoughts were entirely different than the clarification for entry of qualities from parents to offspring that was regular to his time. Inheritance is the passing of discrete units of inheritance, or genes, from parents to offspring. Mendel found that matched pea characteristics were either overwhelming or latent. At the point when pure-bred parent plants were cross-reared, overwhelming qualities were dependably found in the offspring, though latent attributes were covered up until the original (F1) mixture plants were left to

Read More

Albino Gene Investigation

1617 Words | 7 Pages

Subsequently, the lab group answered: “Would it be possible to have had sexually mature parents with either of the traits expressed in the offspring? Explain (Inheritance of a Single Trait - Lab 9, p. 131).” The group decided that yes, it would be possible for the parents to have been sexually mature and still possess the traits necessary to produce an albino offspring. However, the only way this would have been possible was if the parent’s genotype carried the recessive g gene, but the phenotype of said parent or the actual parent was green. If the parent had been albino, and thus lacked

Read More

Homozygous Pea Research Paper

542 Words | 3 Pages

He called this hidden trait the recessive trait. From those results, Mendel inferred that each trait depends on a pair of factors, one of them coming from the mother and the other from the father. Now we know that these factors are called alleles and represent the different variations of a gene. Depending on which type of allele Mendel found in each seed, we can have what we call a homozygous pea, where both alleles are identical, and what we call a heterozygous pea, when the two alleles are different. This combination of alleles is known as genotype and its result, being yellow or green, is called phenotype.

Read More

ABO Blood Group System Analysis

1668 Words | 7 Pages

When the two alleles of a pair are different, one is dominant and the other is recessive Non – Mendelian inheritance is a general term that refers to any pattern of inheritance that does not segregate in accordance to Mendel’s Law. In Mendelian inheritance, each parent contributes one of two possible alleles needed for a trait. There are many example of non – Mendelian inheritance pattern, including incomplete dominance, co-dominance, multiple alleles and sex – linked traits.

Read More

Characteristic Determination: What´s Natural Selection?

752 Words | 4 Pages

For this situation, the reproducer crossbreeds two distinct species--, for example, the serval and the household feline to deliver the Savannah feline. In the same way, as other different half breeds, numerous posterity are sterile. Most fruitlessness in half breeds is brought on by a distinction in chromosome check between the

Read More

Inheriting From Parents: Genetic Traits

190 Words | 1 Pages

When a baby is born they inherit 50% of each parents genetic information in the process of genetic transmition. They transmit their information via their chromosomes during through the gametes they provided during fertilization. There are two specific things that determine a child trait, they are Homozygous and Heterozygous traits. Homozygous trait is Inheriting from parents similar genes for a given trait, while Heterozygous traits are Inheriting from parents different forms of a gene for a given trait. Many different genetic disorders can be transmitted to the child during fertilaztion.

Read More

Genetic Disorders: Color Blindness

594 Words | 3 Pages

Well in the article "Color Vision Deficiency" by Genetics Home Reference, it helps us understand that color blindness is inherited in an X-linked recessive pattern. They also state that, "The OPN1LW and OPN1MW genes are located on the X chromosome, which is one of the two sex chromosomes. In males (who have only one X chromosome), one genetic change in each cell is sufficient to cause the condition. Males are affected by X-linked recessive disorders much more frequently than females because in females (who have two X chromosomes), a genetic change would have to occur on both copies of the chromosome to cause the disorder. A characteristic of X-linked inheritance is that fathers cannot pass X-linked traits to their sons.

Read More

Example Of A Genetic Paper

726 Words | 3 Pages

One method scientists use to organize traits is Punnett Squares. A Punnett Square is a visual way to see the dominant and recessive alleles. "A dominant allele is an allele that will determine the phenotype if just one is present in the genotype" (Wile Durnell 236). "A recessive allele is an allele that will not determine the phenotype unless the genotype is homozygous in that allele. A simple two by two Punnett Square will have one parents genotype on the top and the other parents on the side.

Read More

More about Drosophila Genetics Lab Report

Related Topics

Open Document