Check sibling questions

(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.

 

Answer:

(a)

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 ”. 

Example: 

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.

F1 PROGENY ON CROSSING TALL AND SHORT PEA PLANTS - Teachoo.jpg

(b)

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.

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Transcript

F1 PROGENY ON CROSSING TALL AND SHORT PEA PLANTS Parents Tall Plant Short Plant Progeny (F1 Generation) Tall Plant Tall Plant Tall Plant

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CA Maninder Singh is a Chartered Accountant for the past 12 years and a teacher from the past 16 years. He teaches Science, Accounts and English at Teachoo