Question

which genotype represents a true monohybrid condition?
1)ttrr
2)Ttrr
3)TtRr
4)TTRr​

Answer 1

Answer:

A monohybrid cross is a genetic mix between two individuals who have homozygous genotypes, or genotypes that have completely dominant or completely recessive alleles, which result in opposite phenotypes for a certain genetic trait. ... Typically, this mix determines the dominant genotype.

Answer 2

Answer: None of the genotype represents a true monohybrid condition .

Explanation: A monohybrid cross is type of cross where a true breeding parent ( homozygous for a single trait ) were crossed with a other true breeding plant producing a heterozygous genotype in the first filial generation or in the F1 generation. But the resultant genotype is heterozygous for a single trait. In the figure below there is an example of a monohybrid cross where the tall plant is homozygous for the T allele and the short one is homozygous for  the dwarf t allele . These true breeding plants and called P generation and the offspring is known as the first filial generation or in the F1 generation. When the members of the F1 generation crossed it gives rise to the  F2 or the second filial generation . The cross between true breeding tall and dwarf plant in the P generation yield phenotypically tall plants where as the cross between the hybrid plant of F1 generation gives rise to Tall and dwarf plant in a phenotypic ratio of $3:1$. Therefore either Tt or tt or TT alone can represent a true monohybrid condition. But  all the options given represents dihybrid condition means a cross between two independent traits (example height of plant T and color of flower R)

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