Which of the following is genotypic ratio of Mendel's monohybrid cross?
Which of the following is genotypic ratio of Mendel's monohybrid cross?
The correct option is D 1 : 2 : 1
A monohybrid cross is a breeding experiment between P generation (parental generation) organisms that differ in a single given trait.
Trait: Flower colour
Dominant trait: Red colour
Recessive trait: White colour
The above cross represents two homozygous individuals, one with the dominant trait (red flowering plant, RR) and the other with the contrasting recessive trait (while flowering plant, rr). The F1 generation of these resulted in all heterozygous red flowering individuals (Rr). The F1 generation is self crossed to produce the F2 generation and the results are homozygous and heterozygous red flowering plants (RR, Rr) and homozygous white flowering plants (rr). It is important to point out here that Mendel's experiment and his resultant statistical analysis showed that the total offspring of the F2 generation was 75% red flowering plants and 25% white flowering plants or a 3:1 ratio. If two homozygous traits are crossed, the phenotype of the F1 is called the dominant trait. When two F1 plants are crossed, the F2 phenotype will have representatives of the dominant trait and the recessive trait (the recessive trait will remain hidden in the F1 and reappears in the F2). The phenotypic ratio in the F2 will be 3:2:1, dominant to recessive. Therefore, the F2 generation of a monohybrid cross, with dominance, will result in Phenotypic ratio of 3:1 and Genotypic ratio of 1:2:l.
A monohybrid cross is a breeding experiment between P generation (parental generation) organisms that differ in a single given trait.
Trait: Flower colour
Dominant trait: Red colour
Recessive trait: White colour
The above cross represents two homozygous individuals, one with the dominant trait (red flowering plant, RR) and the other with the contrasting recessive trait (while flowering plant, rr). The F1 generation of these resulted in all heterozygous red flowering individuals (Rr). The F1 generation is self crossed to produce the F2 generation and the results are homozygous and heterozygous red flowering plants (RR, Rr) and homozygous white flowering plants (rr). It is important to point out here that Mendel's experiment and his resultant statistical analysis showed that the total offspring of the F2 generation was 75% red flowering plants and 25% white flowering plants or a 3:1 ratio. If two homozygous traits are crossed, the phenotype of the F1 is called the dominant trait. When two F1 plants are crossed, the F2 phenotype will have representatives of the dominant trait and the recessive trait (the recessive trait will remain hidden in the F1 and reappears in the F2). The phenotypic ratio in the F2 will be 3:2:1, dominant to recessive. Therefore, the F2 generation of a monohybrid cross, with dominance, will result in Phenotypic ratio of 3:1 and Genotypic ratio of 1:2:l.
