Mendel Crossed Tall Pea Plants with Dwarf Pea Plants in His Experiment. Write His Observations Giving Reason on the F1 and F2 Generations. - Science


Mendel crossed tall pea plants with dwarf pea plants in his experiment. Write his observations giving reason on the F1 and F2 generations.



Mendel crossed tall pea plants with dwarf pea plants.

Mendel's Observation

The F1 generation contained all tall plants. When F1 generation underwent selfing, the trait that was unexpressed in F1 (dwarf) was observed in some F2 progeny. Thus, both traits, tall and dwarf, were expressed in F2 generation in the ratio 3:1.

Mendel proposed that something was being passed unchanged from generation to generation. He called these things factors (presently called genes). Factors contain and carry hereditary information.

He also observed that traits might not show up in an individual but were passed to the next generation.

Concept: Heredity
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2013-2014 (March) Delhi Set 2

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"A trait may be inherited, but may not be expressed." Justify this statement with the help of a suitable example.

Define heredity.

A Mendelian experiment consisted of breeding tall pea plants bearing violet flowers with short pea plants bearing white flowers. The progeny all bore violet flowers, but almost half of them were short. This suggests that the genetic make-up of the tall parent can be depicted as:

A Mendelian experiment consisted of breeding pea plants bearing violet flowers with pea plants bearing white flowers. What will be the result in F1 progeny?

What constitutes the link between one generation and the next?


State Mendel's second law of inheritance.

A pregnant woman has an equal chance of her baby being blood group A or blood group AB. Which one of the following shows the possible genotypes of the woman and the father of her child?
(a) IA IA and IB IO
(b) IA IB and IB IO
(c) IA IO and IB IO
(d) IA IB and IA IO

A trait in an organism is influenced by ______ 

A red-haired woman marries a brown-haired man, and all the children are brown haired. Explain this genetically.


Only one of the following characteristic of the parents can be inherited by their children. This one is :
(a) deep scar on chin
(b) snub nose
(c) technique of swimming
(d) cut nose

Explain the mechanism of hereditary changes.

Hereditary characters are transferred from parents to offspring by ______ hence they are said to be structural and functional units of heredity.

Define Heredity. Give two examples.

Answer the following question.
Why are the traits acquired during the life-time-of-an individual not inherited? Explain.

Who is the pioneer of modern genetics?

Write advantages of science of heredity.

____________ refers to the transmission of genetic information from parental generation to next generation.

What are the components of the DNA molecule?


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