You are still crazy about studying plants, kind of like Mendel. You take two var
ID: 260414 • Letter: Y
Question
You are still crazy about studying plants, kind of like Mendel. You take two varieties of plants, one produces a tall plant with blue seeds and a second one produces short plants with white seeds and cross them. All of the seeds are white and when planted they produce all tall plants. The Fa plants are then self-fertilized and the results for the F generation is below. 2. Blue seeds, tall plants White seeds, tall plants 270 Blue seeds, short plants 33 White seeds, short plants 10D 97 What is the expected number of offspring for each phenotype listed? Must show your math to get the credit. A. B. Use a Chi-square test your hypothesis. Must show your work to get credit. Use the X2 chart in your book to answer following questions: what are your degrees of freedom? What is your conclusion? C.Explanation / Answer
Answer:
A).
Phenotypes
Observed
Expected ratio according to Mendel
Expected number
Blue seeds, tall plants
97
3/16*500
93.75
White seeds, tall plants
270
3/16*500
93.75
Blue seeds, short plants
33
1/16*500
31.25
White seeds, short plants
100
9/16 *500
281.25
Total
500
B).
Chi-square value = 448.37
c). Degrees of freedom = number of catergories -1 = 4-1 = 3
A chi-square of 448,37 is greater than the critical value, so we CAN reject the null hypothesis. Genes are linked.
Phenotypes
Observed
Expected ratio according to Mendel
Expected number
Blue seeds, tall plants
97
3/16*500
93.75
White seeds, tall plants
270
3/16*500
93.75
Blue seeds, short plants
33
1/16*500
31.25
White seeds, short plants
100
9/16 *500
281.25
Total
500
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