Please, explain this question using steps to be easily understood. Thank you for
ID: 273499 • Letter: P
Question
Please, explain this question using steps to be easily understood. Thank you for your teaching.
Determine the genetic map of three different house finch traits: beak color (dark vs light), song length (short vs long) and patch size (reduced vs normal). A large experiment was performed involving the usual P0 crossed, with the F1 test crossed. The following are the data for the offspring from the test cross:
Choose the map below that best fits the data
Select one:
a.)Patch Size - 8.49cM - Song Length - 13.04cM - Beak Shade
b.)Beak Shade - 8.49cM - Patch Size - 13.04cM - Song Length
c.)Patch Size - 13.04cM - Beak Shade - 8.49cM - Song Length
d.)Beak Shade - 13.04cM - Patch Size - 8.49cM - Song Length
e.)Patch Size - 13.04cM - Song Length - 8.49cM - Beak Shade
f.)Patch Size - 8.49cM - Beak Shade - 13.04cM - Song Length
Beak Shade Patch Size Song Length Number Observed Dark normal Long 73 Dark normal short 5 Light normal short 404 Light normal Long 50 Light reduced Long 11 Light reduced short 60 Dark reduced short 31 Dark reduced Long 509Explanation / Answer
Answer:
c.)Patch Size - 13.04cM - Beak Shade - 8.49cM - Song Length
Explanation:
Hint: AlwyAl parental progeny are more than the recombinant progeny. So parental combinations are light, normal, short / dark, reduced, long
1). If single cross over between beak shade and patch size..
Normal: light, normal / dark, reduced
After cross over: light, reduced/ dark, normal
Light, reduced = 11+60= 71
Dark, normal = 73+5= 78
Total of this progeny= 149
Total progeny= 1143
Rf= (149/1143)100
=13.04%
2). If single cross over occurs between patch size and song length....
Normal: normal, short / reduced, long
After cross over: normal, long / reduced, short
Normal, long: 73+50= 123
Reduced, short: 60+31= 91
Total of this progeny= 214
Rf= (214/1143)100
= 18.72%
3). If single cross over occurs between beak shade and song length...
Normal: light, short/ dark, long
After cross over: light, long/ dark, short
Light, long= 50+11= 61
Dark, short= 31+5= 36
Total= 97
Rf= (97/1143)100
= 8.49%
Rf(%)= map distance (mu)
Patch size -----13.04 mu---------beak shade-----8.49 mu----------song length