Plant height is controlled by 5 gene pairs. The homozygous dominant is 200 cm tall while the homozygous recessive exhibits 80 cm height. Assume that the alleles have equal contribution and have cumulative effects. The F1 and F2 of the two parents below were studied. Parent 1 Parent 2 DID,D2D2D;D3d4da dsds dıdıd2d2d3d3DąD4 D5D5 a. Compute for the contribution of the dominant allele. b. Compute for the height of parent 1 and parent 2. Provide the genotype and phenotype of the F1. d. Compute for the frequencies of the different individuals in the F2 using the Pascal's triangle. Provide the phenotypes of the F2 and their frequencies. С. е.
a. 1 dominant allele will contribute 120/10 = 12 cm to the base height of the plant.
b. The height of the parent plant 1
Genotype of the parent plant 1 – D1D1D2D2D3D3d4d4d5d5
The height of the parent plant 2
Genotype of the parent plant 2 – d1d1d2d2d3d3D4D4D5D5
Contributing alleles – D4D4D5D5. The height of the plant without any contributing alleles would be 80 cm. The plant with genotype d1d1d2d2d3d3D4D4D5D5 has 4 contributing allele each of which contributes 12 cm to the base. Hence, the height of the plant with genotype d1d1d2d2d3d3D4D4D5D5 would be 80 + 12 + 12 + 12 + 12 = 128 cm.
c. Parents – D1D1D2D2D3D3d4d4d5d5 × d1d1d2d2d3d3D4D4D5D5
Gametes – D1D2D3d4d5 × d1d2d3D4D5
F1 generation – D1d1D2d2D3d3D4d4D5d5
The height of the plants of F1 generation = 80 + 12 + 12 + 12 + 12 + 12 = 140 cm
Hence,
Genotype of the F1 = D1d1D2d2D3d3D4d4D5d5
Now, I only need the answers for D and E, thank you!
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