Mendelian Ratio Of Wings Essay

Butterflies have many genes which are expressed into ways that are either dominant, or recessive. For example to have blue eyes the dominant allele would be (B) and the recessive allele would be (b).

4. Clear wing, Black eye, and Hairless (c, b, and h) are linked, recessive traits carried on

Suppose the feather color of a bird is controlled by two alleles, D and d. The D allele results in dark feathers, while the d allele results in lighter feathers.

The parents are both homozygous. The homozygous dominant would represent the wild type. And the homozygous recessive would represent the other fly parent of a different strain. The F1 generation would consist of 100% Wild Type but they would all be heterozygous in carrying the recessive gene.

Introduction: The intention of this lab was to gain a better understanding of Mendelian genetics and inheritance patterns of the drosophila fruit fly. This was tasked through inspecting phenotypes present in the dihybrid crosses performed on the flies. An experimental virtual fly lab assignment was also used to analyze the inheritance patterns. Specifically, the purpose of our drosophila crosses is to establish which phenotypes are dominant/recessive, if the traits are inherited through autosome or sex chromosomes and whether independent assortment or linkage is responsible for the expressed traits.

When the larvae hatched, the anesthetising procedure shown from steps 1-5 was used to record the phenotype of the F1 generation and number of male or female flies.

There were eight different phenotypes among the progeny. The highest phenotypic frequency was the w+m+f+ at 40% of the progeny. The lowest was the w+mf+ with only 2 % of the progeny (Table 3). The sum of the recombinant frequencies between genes, table 4, was used to determine the gene distance. The recombinant frequency was determined by counting the number of individuals whose genes differed from that of the parental type. For example, how many individuals white eye gene, and miniature wing gene, differed from both wild-type or both mutants. Recombination occurred between the white and miniature gene 33 times. Recombination occurred between the miniature and the forked genes 31 times. Recombination occurred between the white and forked genes 44 time. Double recombination occurred 10 times. Therefore, genes w and f are 64 m.u. apart, m and w are 33 m.u. apart, and m and f are 31 m.u. apart (Figure

Table 1 shows the phenotypes of the F1 flies produced by crossing P1 wild-type females and P1 no-winged mutant males. The results of that cross was that there were forty seven wild-type females and fifty three wild-type males. Therefore there was a total of one hundred wild-type flies that were produced. The observed phenotypic ratio of wild-type flies and no-winged mutant flies was 1:0 (wild-type: no-winged). The predicted phenotypic ratio if the no-winged mutation is autosomal recessive would be 1:0 (winged: no-winged).

11. The progeny of a Drosophila female (heterozygous at three loci: y, ct, and w) crossed to a wild type male are listed below:

Purpose The purpose of this experiment is to determine whether the fruit flies were dominant/recessive or linked/non-linked. The traits I chose for this activity was the fruit fly with vestigial wings and purple eyes, the other fruit fly I chose was a normal fly, also called wild type. While writing out my plan for this activity I thought it would be interesting to test a female mutant and the wild type male, the ratios I came up for this experiment was 2:2 and the mutant allele being recessive to the wild type. In this case, the words recessive and dominant means, if the child born from the parents inherits more of the genes and traits from let us say the father then the alleles of the father is dominant over the mother’s genes.

A. If the wingless mutation is autosomal Dominant on either the female or male then we can expect all of the

We will use Punnett Squares to find out the genotype and phenotype in the offspring of the fruit flies. Our experimental hypothesis of this experiment is that the genes of the fruit flies are linked, where the body color of the fruit fly is dark (b) recessive or light (B) dominant and type of wing, normal wings (W) dominant and abnormal wings (w) recessive is linked. The null hypothesis is that there will be an unlinked ratio for the phenotypes if the loci was

Introduction For centuries, researchers have used Drosophila melanogaster, the common fruit fly, to study genetics. The benefits of using the fruit fly includes: its relatively short generation time, its large amount of available offspring for data, it is easy to store and handle in the laboratory and it is easily and cheaply obtained. Cross-breeding of four types of fruit flies were used in this experiment including: wild type males with normal wings vs. vestigial wing females, wild type males with red eyes vs. white eyed females, wild type male with red eyes vs. sepia eyed females, and wild type males vs. wild type females. In basic mendelian genetics, the terms dominant, recessive and sex-linked are used to describe the different types

For our first generation (F1) of flies we chose to cross apterous (+) females and white-eye (w) males. We predicted that the mutation would be sex linked recessive. So if the female was the sex with the mutation then all females would be wild type heterozygous. Heterozygous is a term used when the two genes for a trait are opposite. The males would all be white eye since they only have one X chromosome. If the males were the sex that had the mutation then all the flies would be wild type but the females would be heterozygous.

Pairs of alternative traits were expressed in the F2 generation on the ratio of ¾ dominant to ¼ recessive (3:1 segregation ratio referred to as Mendelian ratio)