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Question
"It is possible that a trait is inherited but may not be expressed." Give a suitable example to justify this statement.
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Solution
Let us take the following example to justify the above statement.
Mendel crossed tall pea plants with short pea plants.
Mendel's Observation
F1 generation contained all tall plants. When F1 generation underwent selfing, the trait that was unexpressed in F1 (short) was observed in some F2 progeny. Thus, both traits, tall and short, were expressed in F2 generation in the ratio 3 : 1.
The above experiment indicates that although both the traits of tallness and shortness were inherited in F1 plants, only the tallness trait was expressed. This shows that traits may not show up in an individual but are passed on to the next generation.
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RELATED QUESTIONS
In one of his experiments with pea plants, Mendel observed that when a pure tall pea plant is crossed with a pure dwarf pea plant in the first generation, F1, only tall plants appear.
(a) What happens to the traits of the dwarf plants in this case?
(b) When the F1-generation plants were self-fertilised, he observed that in the plants of the second generation, F2, both tall plants and dwarf plants were present. Why it happened? Explain briefly.
How did Mendel interpret his results to show that traits may be dominant or recessive? Describe briefly.
It it an example of monohybrid cross or dihybrid cross?
Why did Mendel choose pea plants for conducting his experiments on inheritance?
When two parents are crossed, the offspring are referred to as :
recessives
test cross
F1 generation
F2 generation
In the human blood grouping, the four basic blood types are type A, type B, type AB, and type O. The blood proteins A and B are :
(a) simple dominant and recessive traits
(b) incomplete dominant traits
(c) codominant traits
(d) sex-linked traits
Answer the following question.
Name the plant Mendel used for his experiment. What type of progeny was obtained by Mendel in F1 and F2 generations when he crossed the tall and short plants? Write the ratio he obtained in F2 generation plants.
____________ refers to the transmission of genetic information from parental generation to next generation.
A cross between pea plant with white flowers (vv) and pea plant with violet flowers (VV) resulted in F2 progeny in which ratio of violet (VV) and white (vv) flowers will be ______.
Rewrite the correct form of the statement by changing the first or last word only:
The inheritable feature of an organism is termed as heredity.
