3. In a Chi Square analysis we determine if the tested results fit our expectati

Question

3. In a Chi Square analysis we determine if the tested results fit our expectations that there is no significant difference between the results we got and the expected results. If there is no significant difference(at the 0.05, or 5%) level, we accept the hypothesis. If there is a significant difference, we reject it. For the following results, set up a Chi-Square analysis and determine if the results are within the Mendelian expectations for an autosomal recessive/dominant trait (Accept), or beyond the expectations (Reject) phenotype ratio 3/4 Y- yellow 1/4 yy wild type 2 Yy OffspringObserved Expected 56 3/4 x 87- 65.25 31 1/4 x 87-21.75 87 yellow wild type Total 87 Use the Chi Square Table in your class lecture notes (or from any Genetics textbook) to get the probability value. Select one: a. Reject the hypothesis b. Accept the hypothesis c. Too much information (TMI)! d. Not enough information to determine

Explanation / Answer

Chi Square value
= ? (Observed - Expected)2 / Expected
= ((56-65.25)2/65.25)) + ((31-21.75)2/21.75))
= 5.24
Corresponding Chi-square value from table with Degrees of Freedom = 2 and at 5% level, we get 5.991
Since the obtained Chi-square is less than the table value, we can conclude that
b. Accept the hyopthesis, as no significant difference than what is expected to occur, no factors other than randomness at play.

Related Questions

Navigate

• Browse (All)
• Browse 3
• Subjects

---

---

Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.