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प्रश्न
How did Mendel interpret his results to show that traits may be dominant or recessive? Describe briefly.
उत्तर
Mendel interpreted his results by observing the first and second filial generations. He observed that even when not expressed in the first filial generation, alternate forms of a trait could retain their identity in the hybrid and could re-emerge in the next generation. He concluded that each factor contained information about a form of a trait.The factor associated with the trait that was expressed in the hybrid offspring was dominant and the factor associated with the trait that remained hidden in the hybrid but reappeared in the next generation was recessive.
संबंधित प्रश्न
How do Mendel's experiment show that traits are inherited independently?
List any two contrasting characters other than height that Mendel used in his experiments in pea plants.
Mendel in one of his experiments with pea plants crossed a variety having round seed with one having wrinkled seeds. Write his observations, giving reasons, of F1 and F2 progeny
Name the scientist who gave the laws of inheritance.
Using height (tallness/dwarfness) of a plant as an example, show that genes control the characteristics or traits in an organism.
Pure-bred pea plants A are crossed with pure-bred pea plants B. It is found that the plants which look like A do not appear in F1 generation but re-emerge in F2 generation. Which of the plants A and B are : (i) tall, and (ii) dwarf? Give reason for your answer.
One of the following traits cannot be inherited. This one is :
(a) colour of eyes
(b) colour of skin
(c) size of body
(d) nature of hair
If we pure-bred tall (dominant) pea plant with pure-bred dwarf (recessive) pea plant we will get pea plants of F1 generation. If we now self-cross the pea plant of F1 generation, then we obtain pea plants of F2 generation.
(a) What do the plants of F2 generation look like?
(b) State the ratio of tall plants to dwarf plants in F2 generation.
(c) State the type of plants not found in F1 generation but appeared in F2 generation, mentioning the reason for the same.
A cross between a tall plant (TT) and short pea plant (tt) resulted in progeny that were all tall plants because
Name the following:
The basic units of heredity.
