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zgrami zgrami
wrote...
Posts: 8
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10 years ago
I got an answer (12,5,17) but I want to confirm... I am a bit uneasy -- I tend to get 16.4 instead of 17?
Source  Genetic Analysis: An Integrated Approach - Sanders/Bowman
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wrote...
Donated
Trusted Member
10 years ago
what does the question read ?

what did you get ?
wrote...
Valued Member
10 years ago
what does the question read ?

zgrami mentions that in the original posting Rightwards Arrow 12,5,17. Problem is, the image is so tiny I can't read the writing Frowning Face Do you mind writing out the question ?
Sunshine ☀ ☼
wrote...
Staff Member
10 years ago
Always post the question word for word:

You plant 1000 tomato seeds resulting from the cross, and get the following results: (data attached) Use the data to complete the linkage map below. Drag the labels onto the chromosome diagram to identify the locations of and distances between the genes. Use the blue labels and blue targets for the genes; use the white labels and white targets for the distances. Gene m has already been placed on the linkage map.

The first thing to do in a trihybrid testcross problem is identify your parental and double cross over classes, ie. the highest and lowest progeny classes.

In this case, your parental classes are MDP and mdp. The double cross over classes are mDp and MdP. The gene in the middle is the one that “flips” between parental and double cross over classes. In this case, you can see that D changes while M and P are constant. Therefore, D is in the middle and the order is MDP.

A cross over between M and D would produce the progeny classes Mdp and mDP. Add the number of these cross overs to the number of double cross overs, and divide by the total progeny: (52+62+2+4)/1000=0.12, or 12 map units.

Doing the same for D and P should give you 0.05, or 5 map units.
This means the distance between M and P would be 12+5=17 map units.
biolove,  hida,  videogames,  cnlopez,  nickyuancong,  tHartog,  maaziz94
- Master of Science in Biology
- Bachelor of Science
wrote...
10 years ago
I could be wrong Face with Stuck-out Tongue

parental a) MDP and b) mdp

c) MmDdPp

d) Mdp and e) mDP.

(52+62+2+4)/1000=0.12, or 12 map units.

Doing the same for D and P should give you 0.05, or 5 map units.

Distance between M and P would be 12+5=17 map unit
Answer verified by a subject expert
lizbet17lizbet17
wrote...
Posts: 2
10 years ago
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wrote...
10 years ago
thank you
wrote...
10 years ago
thank you
wrote...
10 years ago
thank you guys! this is exactly correct!
wrote...
10 years ago
Thanks!
wrote...
10 years ago
a) 12
b) 5
c) 17
d) d
e) p
stha,  lsueross,  Esther7
wrote...
10 years ago
Thanks!!!
wrote...
10 years ago
I got an answer (12,5,17) but I want to confirm... I am a bit uneasy -- I tend to get 16.4 instead of 17?
Thank you!
wrote...
10 years ago
Thank you!
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