Due to the cross between TTRr and ttrr the resultant progenies showed how many percent of plants would be tall, red-flowered?

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75%

50%

65%

80%

answer is B.

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Detailed Solution

Concept: The gene for tall growth of plants is represented by "T" and dwarfism is represented by "t". The red blood gene is represented by the "R" and the white blood gene is represented by the gene "r". In that case, the parental genotype would be heterozygous large red-blooded TTRr and homozygous dwarf white-blooded ttrr.
Parent Phenotype – Crimson x Dwarf White
Parental genotype – TTRr × ttrr
Gamete – TR, Tr, tr, tr

male/female	TR	Tr
tr	TtRrtall red	Ttrrtall white
tr	TtRrtall red	Ttrrtall white

F1 generation phenotype-big red-2, big white-2
F1-generation genotypes-TtRr and Ttrr
Therefore, the proportion of large red flowers in the mating of TTRr and ttrr is 50%.
Therefore, the correct answer is 50%.

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