Question

1 If the minimum and maximum height of
sugarcane plant is 50cm and 200cm respectively
and this character is regulated by 3 polygenes.
Then find out the height
of plants produced
in the progeny aabbcc × AABBcc.​

Answer 1

Answer:

Explanation:Maximum height of a plant is 30ft and minimum height is 10 ft If plant height is controlled by 3 pairs of genes then the height of plant with genotype Aabbcc will be

In the question, it is given that height is controlled by three pairs of genes (6 alleles). According to the values, the maximum height given is 18 feet for AABBCC and minimum height is 6 feet for aabbcc. The plant with genotype AabbCc has 2 dominant allele and hence the height of the plant would be 6+2+2=10 feet!

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Answer 2

Explanation:

We are given the following data

Maximum height = 200 cm

Minimum height = 50 cm

Height regulation = 3 pairs of genes.

Contribution of each polygene = (Maximum height - Minimum height) / No. of polygene

= (200 – 50) / 6 = 25

Contribution of leading polygene in plant having genotype AaBbCc

= 3 x 25 = 75

Height of plant with genotype AaBbCc = Minimum height + Contribution of leading polygene

= 50 + 75 = 125 cm