Details of this Paper

The Punnett Square




Lab Report;Name;Section;Plant Genetics;Exercise 1 - The Punnett Square;1. Write a hypothesis describing the phenotype of the germinating tobacco seeds. Include the;approximate number of seedlings and percentages that will have a dominant trait and;recessive trait out 50 seeds.;2. Create a Punnett square using Data Table 1, showing the possible F2 generation outcomes;from a cross between a heterozygous male and a heterozygous female for the germinating;tobacco seeds. The dominant allele is written as G for green and the recessive allele for;albino/yellow color is written as g.;Data Table 1: Hypothetical Punnett Square;Father (____ ____) x Mother (____ ____);Father;Mother;Gametes;3. Count the number of seedlings that are green versus those that are yellow and record the data;in Data Table 2.;Data Table 2 Seedling data;Seedling Color;Green;Yellow;Number of;Seedlings;1;Total;Percentage of;Total;4.;Compare the expected outcome to actual results found in Data Table 2, write this;information into Data Table 3.;Data Table 3 Frequency calculations;Frequency;Expected Values;Actual Values;Green;Yellow;Total;Questions;5.;What are the predicted ratios of the phenotypes (green to yellow) in the plants?;6. What were the actual ratios of the phenotypes (green to yellow) displayed in the tobacco;plants?;7. If all yellow seedlings were removed from the population, would the next generation still;have a chance at displaying the yellow allele? Explain your answer.;8. Would a cross between a homozygous and a heterozygous parent show the same ratios?;9. Explain why it may be important to collect data from a larger population.;Lab Report;Name;Section;Exercise 2 Dihybrid Crossing with Corn;1. Count the number of purple, yellow, smooth and wrinkled seeds on the ear of corn between;the lines in Figures 4-7 and record the data in Data Table 4.;Data Table 4 Corn kernel data;Number of Kernels;Kernel Percentage (divide count;by total, then multiply by 100);Kernel Coloration;Purple;Yellow;TOTAL;Kernel Texture;Smooth;Wrinkled;TOTAL;2. The ear of corn is a result of a cross between plants that were both heterozygous for color and;texture. Write the genotypes of both parents of this dihybrid cross. (P = purple color, p =;yellow color, S = smooth shape, s = wrinkled shape);3. What are the possible gametes for both parents? (Place these gametes into the Punnett square;in Data Table 5 for both the male and the female.);4. Calculate the phenotypic ratios that are expected for each type of seed.;a. Purple & smooth;b. Purple & winkled;3;c. Yellow & smooth;d. Yellow & wrinkled;Data Table 5 Punnett square for dihybrid cross;Parent Gametes;Gametes;Parent;Gametes;5. Calculate the expected percentage of;a. Purple, smooth kernels;b. Purple, wrinkled kernels;c. Yellow, smooth kernels;d. Yellow, wrinkled kernels;6. Count the number of purple/smooth, purple/wrinkled, yellow/smooth and yellow/wrinkled;kernels on the quarter ear of corn and record the numbers in Data Table 6.;Data Table 6 Data from corn kernels;Number Counted;Ratio: Number;counted/total;Purple and smooth;Purple and wrinkled;Yellow and smooth;Yellow and wrinkled;TOTAL;Questions;7. What are the probable coloration phenotypes of the corncob parents?;8. What are the probable texture phenotypes of the corncob parents?;9. Was the ratio calculated in Data Table 6 equal to 9:3:3:1? If not, given a possible;Lab Report;Name;Section;explanation as to why not.;5


Paper#17627 | Written in 18-Jul-2015

Price : $27