(a) What is the law of dominance of traits? Explain with an example.
(b) Why are the traits acquired during the life time of an individual not inherited? Explain.
The law of dominance of traits states that “When parents having pure contrasting characters are crossed then only one character expresses itself in F1 generation . This character is the dominant character and the character which cannot express itself is called a recessive character ”.
When purebred tall (TT) pea plants are crossed with purebred dwarf (tt) pea plants, all the plants in the F 1 progeny are tall(Tt) .
The appearance of all Tall plants in the F 1 generation shows that tallness is the dominant character while dwarfness is the recessive character.
Traits acquired during the lifetime of an individual do not reflect in the reproductive tissues .
Changes in the non-reproductive tissues are not passed on to the DNA of the germ cells and therefore not inherited by the next generation.