Explain with the help of suitable examples why certain traits cannot be passed on to the next generation? What are such traits called?

Explanation

A trait of an organism which develops in response to the environment and brought in the non-reproductive tissues can not be passed on to the DNA of the germ cells. Such traits are called acquired traits. An individuals cannot pass these traits to its progency as these traits cannot be passed on to the DNA of ther germ cell.
Example `:`
(i) If a beetle does not get sufficient food for a considerable time, its weight will reduce due to starvation. The low weight in an acquired trait.
(ii) Cut tail of a mouse.
or
Mendel crossed pure-bred tall pea plants with pure-bred dwarf pea plants and found that only tall pea plants were produced in the `F_(1)` generation .
Mendel then crossed the tall pea plants of `F_(1)` generation and found that tall plants and dwarf plants were obtained in the `F_(2)` generation in the ratio of `3:1`.
This experiment shows that the traits of dwarfness had not been lost but it was merely concealed in the `F_(1)` generation.
Thus "A trait may be inherited , but may not be expressed. "