I need immediate assistance with this lab!!!!
genitic crosses.doc Download Attachment This is an unformatted preview. Please download the attached document for the original format. Name: Last 4 digits of student ID: Lab section:ETZ6AB Instructor name: Elaine Palucki Lab 6: Genetic Crosses Read Chapter 7 and print out the sample genetic cross 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 Trait Flower color Plant Height Seed Shape Seed Color Dominant phenotype Purple flowers Tall plants Round seeds Yellow seeds Recessive Phenotype White flowers Short Plants Wrinkled seeds Green seeds Part I: Symbols and definitions: 1. Please define each of these words (1 pt) Allele: An allele is an alternative form of a gene (one member of a pair) that is located at a specific position on a specific chromosome. Homozygous: an individual (or a condition in a cell or an organism) containing two copies of the same allele for a particular trait located at similar positions on paired chromosomes; Having two identical alleles that code for the same trait. Herterozygous: an individual (or a condition in a cell or an organism) containing two different alleles for a particular trait; Having dissimilar alleles that code for the same gene or trait. Gentoype: The entire set of genes in an organism; A set of alleles that determines the expression of a particular characteristic or trait (phenotype) 2. For each trait indicate the genotypes that are possible. Use the first letter of the dominant trait to indicate the trait. (2pts) Trait Flower color Plant Height Seed Shape Seed Color Dominant genotype(s) Purple = Tall = Round = Yellow = Recessive genotype(s) White = Short = Wrinkled = Green Pick three of the crosses to complete using any 3 of the last 4 digits of your student ID. Circle the numbers of the crosses you are doing in column 1 below. Cross Number 0 1 2 3 4 5 6 7 8 9 Male parent traits Female parent traits Heterozygous for flower color Homozygous dominant for height Heterozygous for flower color Heterozygous for height Heterozgyous for flower color Heterozygous for seed color Homozygous recessive for flower color Heterozygous for seed color Homozygous recessive for seed shape Homozygous recessive for height Heterozygous for seed shape Heterozygous for height Homozygous dominant for flower color Homozygous recessive for seed shape Heterozygous for flower color Homozygous recessive for seed shape Heterozygous for seed shape Homozygous recessive for seed color Heterozygous for seed shape Heterozygous for seed color Heterozygous for flower color Homozygous dominant for height Homozygous dominant for flower color Heterozygous for height Heterozgyous for flower color Heterozygous for seed color Homozygous dominant for flower color Heterozygous for seed color Heterozygous for seed shape Heterozygous for height Heterozygous for seed shape Homozygous recessive for height Homozygous recessive for flower color Homozygous dominant for seed shape Heterozygous for flower color Homozygous recessive for seed shape Homozygous recessive for seed shape Homozygous recessive for seed color Homozygous recessive for seed shape Homozygous dominant for seed color Now you can use the charts and Punnett squares on each of the following pages to complete your 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 problem for a guide. Sex Male Female Genotype Phenotype 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 Male Female Gamete 1 Gamete 2 Gamete 3 Gamete 4 Step 2: Fill in the Punnett Square below Male 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 phenotype Cross 2: Please write the number of the cross you are performing: ______________ Then fill in the genotype and phenotype for each parent below. Sex Male Female Genotype Phenotype Step 1: Determine the different gamete combinations that each parent can contribute to the offspring. Sex Male Female Gamete 1 Gamete 2 Gamete 3 Gamete 4 Step 2: Fill in the Punnett Square below Male 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 phenotype Cross 3: Please write the number of the cross you are performing: ______________ Then fill in the genotype and phenotype for each parent below. Sex Male Female Genotype Phenotype Step 1: Determine the different gamete combinations that each parent can contribute to the offspring. Sex Male Female Gamete 1 Gamete 2 Gamete 3 Gamete 4 Step 2: Fill in the Punnett Square below Male 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 phenotype Questions: 1. Are gametes haploid or diploid? What about the offspring, are they haploid or diploid? (1pt) 2. A) Can two Tall and Purple flowered parents produce offspring that are Short and have White seeds? Explain using a Punnett square why you think this outcome is possible or not. (1pt) 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. (1pt)