A Mendelian experiment consisted of breeding tall pea plants cross breed with dwarf pea plant.
a) What is the expected height of plants in F1 generation?
b) What will be the percentage of plants which are dwarf in F2 generation when F1 plants were selfed?
c) State the expected ratio of genotype TT and Tt in F2 progeny.
a) What is the expected height of plants in F1 generation?
b) What will be the percentage of plants which are dwarf in F2 generation when F1 plants were selfed?
c) State the expected ratio of genotype TT and Tt in F2 progeny.
a) When Mendel crossed a true breeding tall plant (female parent) with a true breeding plant of the dwarf variety (male parent), he got tall plants like one parent in the first filial generation designated F1. He used the term “dominant” for the tall character which dominated in the F1. generation, and “recessive” for the character of dwarfness which remained hidden (latent) in the F generation. All plants are tall in F1.
b) Self-fertilization of the F1 hybrids produced the second filial generation F2 consisting of a total of 1064 plants of which 787 were tall and 277 were dwarf. That is tall and dwarf plants appeared in F2 in the proportion of 2.84:1 which is roughly equal to 3:1. The percentage of dwarf plants is 25%.
c) In F1 generation TT X Tt will give offspring 50% TT and 50 % Tt. In F2 generation when They are again self-crossed, the gamets will be T from TT and T and t from Tt.
T T T TT TT t Tt Tt
So, the genotype will be 1:1 as 50% homozygous tall and 50% heterozygous tall.
a) When Mendel crossed a true breeding tall plant (female parent) with a true breeding plant of the dwarf variety (male parent), he got tall plants like one parent in the first filial generation designated F1. He used the term “dominant” for the tall character which dominated in the F1. generation, and “recessive” for the character of dwarfness which remained hidden (latent) in the F generation. All plants are tall in F1.
b) Self-fertilization of the F1 hybrids produced the second filial generation F2 consisting of a total of 1064 plants of which 787 were tall and 277 were dwarf. That is tall and dwarf plants appeared in F2 in the proportion of 2.84:1 which is roughly equal to 3:1. The percentage of dwarf plants is 25%.
c) In F1 generation TT X Tt will give offspring 50% TT and 50 % Tt. In F2 generation when They are again self-crossed, the gamets will be T from TT and T and t from Tt.
| T | T | |
| T | TT | TT |
| t | Tt | Tt |
So, the genotype will be 1:1 as 50% homozygous tall and 50% heterozygous tall.
