In soybeans, dwarf (D) is dominant to tall (d), round (R) is dominant to oval (r
ID: 144902 • Letter: I
Question
In soybeans, dwarf (D) is dominant to tall (d), round (R) is dominant to oval (r), and green (G) is dominant to brown (g). The genes are linked and the map is given below. Pure-breeding tall, round, brown plants were mated to pure- breeding dwarf, oval, green plants. The F1 were testcrossed. All loci are autosomal. The coefficient of coincidence is 1 Height Shapo Color 14cM 22cM Rank the progeny phenotypes below to indicate their frequency in the testcross progeny based on the data above. Use 1 to indicate the most frequent then 2, then 3 and let 4 indicate the least frequent. tall, round, brown Choose... tall, round, green Choose... tall, oval, brown tall, oval, green Choose...+ Choose... +Explanation / Answer
Answer:
Tall, Round, Brown ---1---(30.5%)
Tall, Round, Green---- 2—(11%)
Tall, Oval, Brown-----4---(1.5%)
Tall, Oval, Green------3---(7%)
Explanation:
Coefficient of Coincidence (COC) = 1.
It means that the observed and expected double crossover frequency is same.
Interference = 1-COC
DRg/DRg x drG/drG-----Parents
DRg / drG --------F1
F1 x drg/drg---------------Testcross
DRg/drG x drg/drg
Class of gametes
Phenotype
Frequency of reciprocal pair
Numbers
Frequency of each class
Number of progeny frequency * 100 = %
Phenotype
Parental
DRg
1- all recombinant progeny
1-(0.14+0.22+0.03) = 0.61
0.305
30.5%
Tall, Round, Brown
drG
0.305
30.5%
Dwarf, Oval, Green
SCO 1
DrG
RF in region 1 = SCO1
SCO1 = 14/100 = 0.14
0.07
7%
Tall, Oval, Green
dRg
0.07
7%
Dwarf, Round, brown
SCO 2
DRG
RF in region 2 = SCO2 - DCO
SCO2 = 22/100 = 0.22
0.11
11%
Tall, Round, Green
drg
0.11
11%
Dwarf, Oval, Brown
DCO
Drg
(RF in region 1) * (RF in region 2)
14/100 * 22/100 = 0.03
0.015
1.5%
Tall, Oval, Brown
dRG
0.015
1.5%
Dwarf, Round, Green
Class of gametes
Phenotype
Frequency of reciprocal pair
Numbers
Frequency of each class
Number of progeny frequency * 100 = %
Phenotype
Parental
DRg
1- all recombinant progeny
1-(0.14+0.22+0.03) = 0.61
0.305
30.5%
Tall, Round, Brown
drG
0.305
30.5%
Dwarf, Oval, Green
SCO 1
DrG
RF in region 1 = SCO1
SCO1 = 14/100 = 0.14
0.07
7%
Tall, Oval, Green
dRg
0.07
7%
Dwarf, Round, brown
SCO 2
DRG
RF in region 2 = SCO2 - DCO
SCO2 = 22/100 = 0.22
0.11
11%
Tall, Round, Green
drg
0.11
11%
Dwarf, Oval, Brown
DCO
Drg
(RF in region 1) * (RF in region 2)
14/100 * 22/100 = 0.03
0.015
1.5%
Tall, Oval, Brown
dRG
0.015
1.5%
Dwarf, Round, Green
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