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Genetic_crosses_lab_6 Fall 2014

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Question;Lab 6: Genetic;Crosses;Name;Lab;section;Lab Instructor?s;name;Last;4 digits of your CUNYFirst Empl ID #;Fall 2014;Read 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;Phenotype;Flower;color;Purple;flowers;White;flowers;Plant;Height;Tall;plants;Short;Plants;Seed;Shape;Smooth;seeds;Wrinkled;seeds;Seed;Color;Yellow;seeds;Green;seeds;Part 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 GENOTYPESthat 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;=;Green;Pick 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 traits;0;Heterozygous for flower color;Heterozygous for height;Homozygous dominant for flower;color;Heterozygous for height;1;Heterozygous for flower color;Homozygous dominant for height;Heterozygous for flower color;Homozygous dominant for height;2;Heterozygous for flower color;Heterozygous for seed color;Heterozygous for flower color;Heterozygous for seed color;3;Homozygous recessive for flower;color;Heterozygous for seed color;Homozygous dominant for flower;color;Heterozygous for seed color;4;Homozygous recessive for seed;shape;Homozygous recessive for height;Heterozygous for seed shape;Heterozygous for height;5;Heterozygous for seed shape;Heterozygous for height;Heterozygous for seed shape;Homozygous recessive for height;6;Homozygous dominant for flower;color;Homozygous recessive for seed;shape;Homozygous recessive for flower;color;Homozygous dominant for seed;shape;7;Heterozygous for flower color;Homozygous recessive for seed;shape;Heterozygous for flower color;Homozygous recessive for seed;shape;8;Heterozygous for seed shape;Heterozygous for seed color;Homozygous recessive for seed;shape;Homozygous dominant for seed;color;9;Heterozygous for seed shape;Homozygous recessive for seed;color;Homozygous recessive for seed;shape;Homozygous recessive for seed;color;Now 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;Phenotype;Male;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 4;Male;Female;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;Genotype;Phenotype;Male;Female;Step 1: Determine the different gamete combinations;that each parent can contribute to the offspring.;Sex;Gamete 1;Gamete 2;Gamete 3;Gamete 4;Male;Female;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;Genotype;Phenotype;Male;Female;Step 1: Determine the different gamete combinations;that each parent can contribute to the offspring.;Sex;Gamete 1;Gamete 2;Gamete 3;Gamete 4;Male;Female;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 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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