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Using Punnett Squares Punnett squares are one good way to predict the outcome of genetic crosses. Punnett squares use mathematical probability to help predict the genotype and phenotype combinations in genetic crosses. The number of possible alleles from each parent determines the number of rows and columns in the Punnett square. Independent Assortment KEY QUESTION How do alleles segregate when more than one gene is involved? Mendel wondered if the segregation of one pair of alleles affects another pair. For example, does the gene that determines the shape of a seed affect the gene for seed color? This type of experiment is known as a two-factor, or dihybrid, cross because it involves two different genes. Single-gene crosses are monohybrid crosses. Visual Reading Tool: Two-Factor Cross: F₂ The Punnett square shows the results of self-crossing the F, generation of a cross between round yellow peas and wrinkled green peas. 1. List the different genotypes in the F, generation. What is the frequency of each genotype? One is filled out for you. RrYy ry RY Ry RY RRYY RRYY RrYY RrYy Ry RRYY RRyy RrYy Rryy Genotype Frequency RrYy ry RrYY RrYy rrYY rrYy RRYY 1 16 ry RrYy Rryy rrYy rryy F₂ Generation 2. List the different phenotypes in the F, generation. What is the frequency of each phenotype? One is filled out for you. Phenotype Frequency 1 rryy 16 wrinkled, green 1 16

Using Punnett Squares Punnett squares are one good way to predict the outcome of genetic crosses. Punnett squares use mathematical probability to help predict the genotype and phenotype combinations in genetic crosses. The number of possible alleles from each parent determines the number of rows and columns in the Punnett square. Independent Assortment KEY QUESTION How do alleles segregate when more than one gene is involved? Mendel wondered if the segregation of one pair of alleles affects another pair. For example, does the gene that determines the shape of a seed affect the gene for seed color? This type of experiment is known as a two-factor, or dihybrid, cross because it involves two different genes. Single-gene crosses are monohybrid crosses. Visual Reading Tool: Two-Factor Cross: F₂ The Punnett square shows the results of self-crossing the F, generation of a cross between round yellow peas and wrinkled green peas. 1. List the different genotypes in the F, generation. What is the frequency of each genotype? One is filled out for you. RrYy ry RY Ry RY RRYY RRYY RrYY RrYy Ry RRYY RRyy RrYy Rryy Genotype Frequency RrYy ry RrYY RrYy rrYY rrYy RRYY 1 16 ry RrYy Rryy rrYy rryy F₂ Generation 2. List the different phenotypes in the F, generation. What is the frequency of each phenotype? One is filled out for you. Phenotype Frequency 1 rryy 16 wrinkled, green 1 16

Concepts of Biology
Concepts of Biology
1st Edition
ISBN:9781938168116
Author:Samantha Fowler, Rebecca Roush, James Wise
Publisher:Samantha Fowler, Rebecca Roush, James Wise
Chapter8: Patterns Of Inheritance
Section: Chapter Questions
Problem 2ACQ: Figure 8.10 In pea plants, purple flowers (P) are dominant to white (p), and yellow peas (Y) are...
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Using Punnett Squares Punnett squares are one good way to predict the outcome of genetic crosses. Punnett squares use mathematical probability to help predict the genotype and phenotype combinations in genetic crosses. The number of possible alleles from each parent determines the number of rows and columns in the Punnett square. Independent Assortment KEY QUESTION How do alleles segregate when more than one gene is involved? Mendel wondered if the segregation of one pair of alleles affects another pair. For example, does the gene that determines the shape of a seed affect the gene for seed color? This type of experiment is known as a two-factor, or dihybrid, cross because it involves two different genes. Single-gene crosses are monohybrid crosses. Visual Reading Tool: Two-Factor Cross: F₂ The Punnett square shows the results of self-crossing the F, generation of a cross between round yellow peas and wrinkled green peas. 1. List the different genotypes in the F, generation. What is the frequency of each genotype? One is filled out for you. RrYy ry RY Ry RY RRYY RRYY RrYY RrYy Ry RRYY RRyy RrYy Rryy Genotype Frequency RrYy ry RrYY RrYy rrYY rrYy RRYY 1 16 ry RrYy Rryy rrYy rryy F₂ Generation 2. List the different phenotypes in the F, generation. What is the frequency of each phenotype? One is filled out for you. Phenotype Frequency 1 rryy 16 wrinkled, green 1 16
Transcribed Image Text:Using Punnett Squares Punnett squares are one good way to predict the outcome of genetic crosses. Punnett squares use mathematical probability to help predict the genotype and phenotype combinations in genetic crosses. The number of possible alleles from each parent determines the number of rows and columns in the Punnett square. Independent Assortment KEY QUESTION How do alleles segregate when more than one gene is involved? Mendel wondered if the segregation of one pair of alleles affects another pair. For example, does the gene that determines the shape of a seed affect the gene for seed color? This type of experiment is known as a two-factor, or dihybrid, cross because it involves two different genes. Single-gene crosses are monohybrid crosses. Visual Reading Tool: Two-Factor Cross: F₂ The Punnett square shows the results of self-crossing the F, generation of a cross between round yellow peas and wrinkled green peas. 1. List the different genotypes in the F, generation. What is the frequency of each genotype? One is filled out for you. RrYy ry RY Ry RY RRYY RRYY RrYY RrYy Ry RRYY RRyy RrYy Rryy Genotype Frequency RrYy ry RrYY RrYy rrYY rrYy RRYY 1 16 ry RrYy Rryy rrYy rryy F₂ Generation 2. List the different phenotypes in the F, generation. What is the frequency of each phenotype? One is filled out for you. Phenotype Frequency 1 rryy 16 wrinkled, green 1 16
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