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Find the frequency of AabbCcDdee if parents are AabbCCddEe and AabbccDdee. Options are : a) 0.78%b) 12.5%b) 25%c) 50%Please explain me the solution.

Find the frequency of AabbCcDdee if parents are AabbCCddEe and AabbccDdee. Options are : a) 0.78%b) 12.5%b) 25%c) 50%Please explain me the solution.

Grade:12th pass

2 Answers

Arun
25763 Points
3 years ago
Dear Amisha
 
Since the inheritance of each gene is independent, So in order to solve this problem, each gene is analysed separately.
 
1. Aa x Aa = 1/4 AA; 1/2 Aa and 1/4 aa. This means 1/2 offsprings have Aa.
2.      bb x bb = all bb = 1.  
3.      CC x cc = all Cc = 1
4. Dd x dd=  1/2​ Dd, 1/2 dd. This means 1/2 offsprings have Dd.
5.      Ee x ee =  1/2​ Ee, 1/2 ee. This means 1/2 offsprings have ee.
Phenotypic proportion that look like AabbCcDdee
 1/2 x 1 x 1 x 1/2 x 1/2 = 1/8.
Hence in% = 100/8 = 12.5%
 
Regards
Arun(askIITians forum expert)
ankit singh
askIITians Faculty 614 Points
one year ago
According to the law of independent inheritance, the alleles are inherited independently. Hence, in the given question, each gene is analysed separately.
 
1. Aa x Aa = 1/4 AA, 1/2 Aa and 1/4 aa. Hence, 1/2 or 50% offsprings will have Aa.
2. Similarly, bb x bb = all bb. Hence, all offsprings will have bb.  
3. cc x CC = all Cc. Hence, all ossprings will have Cc. 
4. Dd x dd =  1/2​ Dd and 1/2 dd. Hence, 1/2 or 50% offsprings will have Dd.
5. Ee x ee =  1/2​ Ee and 1/2 ee. Hence, 1/2 or 50% offsprings will have ee.
Hence, frequency of AabbCcDdee will be 1/2 x 1 x 1 x 1/2 x 1/2 = 1/8, which is equal to 12.5%.
Thus, the correct answer is '12.5%.

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