In a cross between two doubly heterozygous Ursa gummi, we observe 1654 Brave Urs
ID: 96848 • Letter: I
Question
In a cross between two doubly heterozygous Ursa gummi, we observe 1654 Brave Ursa gummi and 110 Timid Ursa gummi. If the Brave phenotype is the dominant phenotype, make a decision as to whether these data are consistent with the duplicate dominant epistatic mode of inheritance. Make your decision based on a significance level threshold of 5%.
A. Decision is: no, they are not. The mode of inheritance is Duplicate Recessive Epistasis.
B. Decision is: yes, they are. Chi-square p-value > 0.05.
C. Decision is: no, they are not. Chi-square p-value < 0.05.
D. Decision is: no, they are not. Chi-square p-value > 0.05.
E. Decision is: Yes, they are. Chi-square p-value < 0.05.
ANSWER IS NOT E
Explanation / Answer
Answer:
In duplicate dominant epistatic mode of inheritance alleles of both the gene produce the same effect. The phenotypic ratio obtained in a duplicate dominant epsitatic mode of inheritance is 15:1
Based on the information given:
A. Decision is: no, they are not. The mode of inheritance is Duplicate Recessive Epistasis.
B. Decision is: yes, they are. Chi-square p-value > 0.05 - - Correct Answer
C. Decision is: no, they are not. Chi-square p-value < 0.05.
D. Decision is: no, they are not. Chi-square p-value > 0.05
E. Decision is: Yes, they are. Chi-square p-value < 0.05.
Observed (O) Expected ('E) (O-E)2/E 110 111 0.0000 1654 1654 0.0000 Sum 0.0000