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BIO 1010 Lab 6: Genetic Crosses Fall 2014

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Question;Lab 6: Genetic CrossesName: ______________________________Lab section: ____________Lab Instructor?s name: _____________________Last 4 digits of your CUNYFirst Empl ID #: _____________Fall 2014Read Chapter 7 and print out the sample genetic cross posted below the lab on the portal, to use as a guide.Below is a list of the phenotypes used in this lab. These are all single gene traits that show complete dominance. Use this information to set up and analyze your crosses.Trait Dominant phenotype Recessive PhenotypeFlower color Purple flowers White flowersPlant Height Tall plants Short PlantsSeed Shape Smooth seeds Wrinkled seedsSeed Color Yellow seeds Green seedsPart I: Symbols and definitions:1. a) What is an allele? What is a gene? Give an example of 2 alleles of a human gene. (0.5 pts)b) What is the difference between an organism that is a homozygote and one that is a heterozygote? (0.25 pts)c) What is the difference between an organism?s genotype and its phenotype? (0.25 pts)2. For each trait in the table below, indicate ALL OF THE GENOTYPES that are possible. Use the first letter of the dominant trait to indicate the trait. (2pts)Trait Dominant genotype(s) Recessive genotype(s)Flower color Purple = White =Plant Height Tall = Short =Seed Shape Smooth = Wrinkled =Seed Color Yellow = GreenPick three of the crosses to complete using any 3 of the last 4 digits of your CUNYFirst BC student Empl ID. If there are repeats, pick random numbers, so you are doing 3 different crosses. Circle the numbers of the crosses you are doing in column 1 below.You must pick 3 different crosses. If there are multiple repeated numbers in your ID, pick additional numbers of your choice.Cross Number Male parent traits Female parent traits0 Heterozygous for flower colorHeterozygous for height Homozygous dominant for flower colorHeterozygous for height1 Heterozygous for flower colorHomozygous dominant for height Heterozygous for flower colorHomozygous dominant for height2 Heterozygous for flower colorHeterozygous for seed color Heterozygous for flower colorHeterozygous for seed color3 Homozygous recessive for flower colorHeterozygous for seed color Homozygous dominant for flower colorHeterozygous for seed color4 Homozygous recessive for seed shapeHomozygous recessive for height Heterozygous for seed shapeHeterozygous for height5 Heterozygous for seed shapeHeterozygous for height Heterozygous for seed shapeHomozygous recessive for height6 Homozygous dominant for flower colorHomozygous recessive for seed shape Homozygous recessive for flower colorHomozygous dominant for seed shape7 Heterozygous for flower colorHomozygous recessive for seed shape Heterozygous for flower colorHomozygous recessive for seed shape8 Heterozygous for seed shapeHeterozygous for seed color Homozygous recessive for seed shapeHomozygous dominant for seed color9 Heterozygous for seed shapeHomozygous recessive for seed color Homozygous recessive for seed shapeHomozygous recessive for seed colorNow you can use the charts and Punnett squares on each of the following pages to complete your crosses. You can use the sample of a genetic cross posted on the BioPortal directly below the lab for a guide in doing these crosses.Cross 1: Please write the number of the cross you are performing: ______________Then fill in the genotype and phenotype for each parent below. Use the sample of a genetic cross posted on the portal directly below the lab for a guide.Sex Genotype PhenotypeMale Female Step 1: Determine the different gamete combinations that each parent can contribute to the offspring. Check the hint from the sample problem when you are doing this.Sex Gamete 1 Gamete 2 Gamete 3 Gamete 4Male Female Step 2: Fill in the Punnett Square belowMale gametes place across?Female Gametes:Place below:? Step 3: Find the Phenotype of each of the 16 combinations in your Punnett Square page.Phenotype you?ve found in offspring Number of offspring with this phenotypeCross 2: Please write the number of the cross you are performing: ______________Then fill in the genotype and phenotype for each parent below.Sex Genotype PhenotypeMale Female Step 1: Determine the different gamete combinations that each parent can contribute to the offspring.Sex Gamete 1 Gamete 2 Gamete 3 Gamete 4Male Female Step 2: Fill in the Punnett Square belowMale gametes place across?Female Gametes:Place below:? Step 3: Find the Phenotype of each of the 16 combinations in your Punnett Square page.Phenotype you?ve found in offspring Number of offspring with this phenotypeCross 3: Please write the number of the cross you are performing: ______________Then fill in the genotype and phenotype for each parent below.Sex Genotype PhenotypeMale Female Step 1: Determine the different gamete combinations that each parent can contribute to the offspring.Sex Gamete 1 Gamete 2 Gamete 3 Gamete 4Male Female Step 2: Fill in the Punnett Square belowMale gametes place across?Female Gametes:Place below:? Step 3: Find the Phenotype of each of the 16 combinations in your Punnett Square page.Phenotype you?ve found in offspring Number of offspring with this phenotypeQuestions:1. Are gametes haploid or diploid? What about the offspring, are they haploid or diploid? (1pt)2. a) Can two purple flowered and yellow seeded parents produce offspring that have white flowers and green seeds?Explain using a Punnett square why you think this outcome is possible or not. (1 pt)b) Can two short and green seeded parents produce offspring that are tall and have yellow seeds?Explain using a Punnett square why you think this outcome is possible or not. (1 pt)

 

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