Name the phenomenon that governs the following:
No 'medium height plants' are obtained in `F_1 `generation, upon crossing pure tall and drawf pea plants.

On crossing two heterozygous tall plants (Tt), a total of 500 plants were obtained in F_(1) generation. What will be the respective number of tall and dwarf plants obtained of F_(1) generation ?

Pure-bred tall pea plants are first crossed with pure-bred dwarf pea plants. The pea plants obtained in F_(1) generation are then cross-bred to produce F_(2) generation of pea plants. (i) What do the plants of F_(1) generation look like ? (b) What is the ratio of all plants to dwarf plants in F_(2) generation ? (c) Which type of plants were missing in F_(1) generation but reappeared in F_(2) generation ?

Name the plant Mendel used for his experiment. What type of progeny was obtained by Mendel in F_(1) and F_(2) generations when he crossed the tall and short plants? Write the ratio he obtained in F_(2) generation plants.

TT Pea plant is crossed to tt plant. F_(2) generation will have

" Heterozygous tall pea plant is crossed with a dwarf pea plant.This is "

When at hetorozygous tal pea plant of F_(1) generation upon self fertilization produces tall and dwarf phenotypes it proves the principle of :-