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the height of a plant is under the control of polygenic inhritance. the plant having genotype aabb has 20 cm height and height of plant having genotype AaBb is 50 cm what will be height of plant having AaBB genotype?

i think it should be slightly bigger than 50cm ..because in first case both are recessive so that is the smallest height of the plant,2nd case both are heterozygous dominant and so both genes express their partial expressions for the height of the plant while the last one have a pair of homozygous dominant and heterozygous dominant genes so as it have one homozygous dominant trait it should have definitely large size than the first one and to an extent large size than the second one too..this is my approach confirm from the experts

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During polygenic inheritance,the external expression depends upon the no. of dominant alleles.Insecond case,there are 2 dominant alleles so height is 50cm. in third case there are 3 dominant genes so the height will be greater than 50 cm

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Here, minimum height is given i.e 20cm (as all the alleles of aabb are recessive)
Height of plant having genotype AaBb is also given i.e 50cm
​Here, in genotype AaBb, 2 dominant polygenes are present.
We know, Height of plant = Minimum height + Contribution of dominant     ​    ​                                                                                                               polygene
                                  50    =  20 + (2 x Contribution of each dominant polygene )
   ​ Contribution of each dominant polygene = 30/2 = 15
Height of plant having genotype AaBB = ​Minm height + Contribution of                                                                                                               dominant polygene 
                                                               = 20 + 3 x 15
                                                               = 20 + 45
                                                               = 65 cm
 
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Answer given is 80 cm
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got it..

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answer given is 80..
 
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the height of a plant is under the control of polygenic inhritance. the plant having genotype aabb has 20 cm height and height of plant having genotype AaBb is 50 cm what will be height of plant having AaBB genotype?
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