You are performing a three-point test cross in order to map the order and distance between...

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Biology

You are performing a three-point test cross in order to map theorder and distance between three genes, designated X,Y, and Z, and you obtain the followingresults:
Phenotypes Â Â Â Â Number Observed
+ Y+Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â 1
+ +ZÂ Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â 72
X +ZÂ Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â 2
X Y+Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â 70
X ++Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â 3
+ Y ZÂ Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â 2
X Y ZÂ Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â 0
+ ++Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â 0
Which gene is in the middle?
a) X
b) Y
c) Z
d) There is not enough data to make this determination.
Which is the coefficient of coincidence for this data set?
a) 0
b) 1
c) 8
d) 0.5
e) There is not enough data to make this determination.

Answer & Explanation Solved by verified expert

4.4 Ratings (808 Votes)

1 Middle gene Z 2 a 0 Explanation Hint Always parental combinations are more numbered thant any other combinations Hence triple heterozygote would be XYZ 1 If See Answer

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