I want tagarwal to answer this Plant Genetics…
I want tagarwal to answer this Plant Genetics questions 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