An experiment to determine the inheritance of fur color mates two mice. A true b
ID: 144260 • Letter: A
Question
An experiment to determine the inheritance of fur color mates two mice. A true breeding mouse crossed with a true breeding mouse with red hair. All the offspring (F1 generation) are purple. A) Based on this, what is the dominant trait and the recessive trait? B) What is the genotype of all of the F1 generation? with purple hair is The F1 animals are crossed and produce the following (F2) progeny. 290 purple mice 110 red mice C. Do these numbers make sense?.. What is your hypothesis that would explain the ratio of the F2 progeny? D. Use a Chi-square test to determine whether those numbers fit a Mendelian pattern of inheritanceExplanation / Answer
Answer:
A).
Dominant trait is purple
Recessive trait is red
B).
Purple = P
Red = p
F1 genotype is Pp (Purple)
C). Yes the given numbers are acceptable.
According to Mendle monohybrid F2 genotypic ratio is 3:1
D).
Accoding to Mendel, expected purple is 300 and red is 100.
Phenotype
Observed(O)
Expected (E)
O-E
(O-E)2
(O-E)2/E
White
290
300
-10
100.00
0.33
Red
110
100
10
100.00
1.00
400
74
1.33
Chi-Squaer value = 1.33
Degrees of freedom = number of phenotypes -1
= 2-1 = 1
Based off of the Chi-square value of 1.33, we determine that it is less than the critical value of 3.84, so we CAN NOT reject the null hypothesis.
The number fit in Mendilian pattern of inheritance.
Phenotype
Observed(O)
Expected (E)
O-E
(O-E)2
(O-E)2/E
White
290
300
-10
100.00
0.33
Red
110
100
10
100.00
1.00
400
74
1.33
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