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Classic Mendelian genetics using fruit fly crosses and a Punnett Square.

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This assignment should help assess your knowledge and understanding of Chapter 10 concepts involving classic Mendelian genetics using fruit fly crosses and a Punnett Square.;Directions;Please complete the Virtual Laboratory Activity: Punnett Square, found here http://www.mhhe.com/biosci/genbio/virtual_labs_2K8/pages/PunnettSquares.html;Be sure to read the "Instructions" document before beginning the lab exercise.;Complete the lab exercise portion by clicking on the "Laboratory Exercise" link.;Complete parts I and II of the "Post Lab Quiz and Lab Report" by clicking on the appropriate link. For your convenience, here is the worksheet, PunnettSquaresWorksheet.doc.;Save this document as "Unit 3 Virtual Lab Report_Your Last Namt" in.rtf,.doc, or.docx format.;Complete the worksheet and submit it as an attachment using the link above, Unit 3 Virtual Laboratory.;Grading;Required, 30 points.;Attachment Preview;PunnettSquaresWorksheet.doc Download Attachment;Virtual Lab: Punnett Squares;Worksheet;Part I: Answer the following questions;1. Which of the following is most inclusive?;a. allele;b. genotype;2. Dominant alleles are represented by;a. an upper case letter;b. a lower case letter;c. it does not matter what type of letter is used;3. In fruit flies, gray body color is dominant over black body color. Using the;letter G to represent body color, what is the genotype of a heterozygous gray;bodied;fly?;a. GG;b. gg;c. Gg;d. GGgg;4. All of the offspring of two gray bodied flys are also gray. What can you;conclude about the genotypes of the parent flies?;a. They are both heterozygous;b. They are both homozygous dominant;c. They are both homozygous recessive;d. You cannot conclude anything definitively about the parental;genotypes;5. Some of the offspring of two gray bodied flies are black. What can you;conclude about the genotypes of the parent flies?;a. They are both heterozygous;b. They are both homozygous dominant;c. They are both homozygous recessive;d. You cannot conclude anything definitively about the parental;genotypes;Part II: Follow the instructions in the Question column to complete the virtual lab;scenarios and record your data;Complete all ten scenarios and record your results in Table 1.;When you record a ratio, whether it is genotypic or phenotypic ratio, always record the;most dominant characteristic first, followed by the recessive. For example, when;recording genotypic ratios;1) If your offspring genotypes include 1 GG, 2 Gg, and 1 gg, the ratio would be;1;GG: 2 Gg: 1 gg;2) If your offspring genotypes include 2 GG and 2 Gg, the ratio would be;2;GG: 2 gg (or 1:1 in the reduced form);3) If your offspring genotypes are 4 gg, then the ratio would be written as;4;gg;When you record phenotypic ratios for a monohybrid cross, there are only two possible;phenotypes - either the dominant phenotype or the recessive phenotype. So you do not;need to indicate the phenotype, simply put the dominant # first, followed by the recessive;#;4) If your offspring phenotypes are 3 dominant and 1 recessive, the ratio is;3:1;5) If your offspring phenotypes are 4 dominant and 0 recessive, the ratio is;4:0;6) If your offspring phenotypes are 0 dominant and 4 recessive, the ratio is;0:4;Table 1;Scenario #;1;2;3;4;5;6;7;8;9;10;Genotype of;Parent I;Genotype of;Parent II;Genotypic Ratio;of Offspring;Phenotypic Ratio;of Offspring

 

Paper#15192 | Written in 18-Jul-2015

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