Pure breed tall pea plants are first crossed with pure dwarf plants . The pea plants obtained in F 1 generation are then crossed to produce F2 generation of pea plants .
A. What do the plants of F1 generation look like
B. What is the ratio of tall plants to the dwarf plants in F2 generation
C. Which type of plants are missing in F1 generation but reappeared in F2 generation ,give reason .
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Pure breeding plants contain similar alleles in a pair (homozygous condition) for a particular trait.
On crossing pure breeding tall pea plant (TT) with pure breeding dwarf plant (tt).
Ans1) Plants of F1 generation are all tall (Tt).
Ans2) Ratio of tall plants to dwarf plants obtained in F2 generation is 3:1.
Ans3) Dwarf plants were not found in F1 generation, but appeared in F2 generation.
This occurred due to dominance of allele responsible for tallness (T) over recessive allele responsible for dwarfness (t) in a pea plant. The recessive alleles are expressed only in homozygous condition/similar alleles in pair (tt). The offspring obtained in F1 generation were all heterozygous (Tt), in that condition, dominant allele controlling the trait of tallness (T) overpowers the recessive allele(t). This is in accordance to law of dominance given by Mendel. This law explains expression of only one of the parental character in F 1 generation and expression of both in F2 generation.
On crossing pure breeding tall pea plant (TT) with pure breeding dwarf plant (tt).
Ans1) Plants of F1 generation are all tall (Tt).
Ans2) Ratio of tall plants to dwarf plants obtained in F2 generation is 3:1.
Ans3) Dwarf plants were not found in F1 generation, but appeared in F2 generation.
This occurred due to dominance of allele responsible for tallness (T) over recessive allele responsible for dwarfness (t) in a pea plant. The recessive alleles are expressed only in homozygous condition/similar alleles in pair (tt). The offspring obtained in F1 generation were all heterozygous (Tt), in that condition, dominant allele controlling the trait of tallness (T) overpowers the recessive allele(t). This is in accordance to law of dominance given by Mendel. This law explains expression of only one of the parental character in F 1 generation and expression of both in F2 generation.