Copy of FA 23 BIO 1131 Lab 2 Worksheet

Name: BIO 1131 Fall 2023 Lab 2 Assignment Make a copy of this document, DO NOT REQUEST ACCESS. fill in your answers during and after your lab in google docs, and then download as a .docx or .pdf file to submit to Canvas by your lab section’s due date Mendelian Genetics: 1. What is the expected ratio of dominant and recessive phenotypes in a monohybrid cross? In a dihybrid cross? 3:1 ratio of phenotypes and a 9:3:3:1 2. What is the expected ratio of genotypes in a monohybrid cross? 1:2:1 Ratio 3. If a pea plant from a true-breeding strain with yellow seeds (YY) is crossed with a pea plant from a true-breeding strain with green seeds (yy), label the Punnett square below with the parental genotypes and the offspring genotypes. [Y] [Y] [y] Yy Yy [y] Yy Yy 4. For the cross above, what % of offspring will have green seeds? There's a zero percent chance of having green seeds. 5. What would happen if you took one of the offspring from the cross in #3 and self-fertilized it to produce a second generation? Draw the resulting Punnett square. [Y] [y] [Y] YY Yy [y] Yy yy 6. For the cross above, what % of offspring will have green seeds? There's a 25% chance of having green seeds.

Experiment 1: Corn Genetics 7. For this experiment, our parental generation was a cross between a plant with purple smooth kernels (RRNN) and a plant with yellow shrunken kernels (rrnn). What is the genotype of every offspring produced by this cross (the F 1 generation)? RrNn 8. The F 1 generation was self-fertilized to create the F 2 generation, and how would you represent this with a Punnett square? Fill in the table below with the parental genotypes and the offspring genotypes. [RN] [rN] [Rn] [rn] [RN] RRNN RrNN RRNn RrNn [rN] RrNN rrNN RrNn rrNn [Rn] RRNn RrNn RRnn Rrnn [rn] RrNn rrNn Rrnn rrnn Chi-Square Analysis 9. Fill out the table below using Table 4 from the lab manual. Phenotype Observed (o) Expected (e) (o − e) (o − e) 2 / e Purple Smooth 2,545 2419 126 6.56 Purple Shrunken 661 806 -145 26.09 Yellow Smooth 831 806 25 0.78 Yellow Shrunken 265 268 -3 .03 Total =4302 4299 3 Sum ( χ 2) =33.42 What is the chi-square value ( χ 2) ___33.46____ Degrees of Freedom = __3____