Advertisements
Advertisements
प्रश्न
Using height (tallness/dwarfness) of a plant as an example, show that genes control the characteristics or traits in an organism.
Explain with an example, how genes control the characteristics (or traits).
उत्तर
A gene is the section of DNA on a chromosome that codes the formation of a protein controlling a specific characteristic of the organism. Suppose, a plant progeny possesses gene for the characteristic called 'tallness'. The gene for tallness will give instructions to the plant cells to generate many plant-growth hormones due to which the plant will grow tall. On the other hand, if the plant has the gene for shortness, less plant-growth hormones will be produced, due to which the plant will not grow much and remain a dwarf plant.
APPEARS IN
संबंधित प्रश्न
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.
Define heredity.
A man having blood group O marries a woman having blood group B and they have a daughter. What will be the blood group of the daughter?
What is the genotype of dwarf plants which always produced dwarf offspring?
For his experiments on heredity, Mendel used :
papaya plants
potato plants
pea plants
pear plants
The visible characteristic in an organism is known as :
(a) prototype
(b) stereotype
(c) phenotype
(d) genotype
In the following Question, the Assertion and Reason have been put forward. Read the statements carefully and choose the correct alternative from the following:
Assertion: When pure breed tall plants are crossed with pure breed short plants, all the plants in F1 progeny are tall. When the tall plants of F1 progeny are crossed, short plants re-appear in F2 progeny.
Reason: Traits are independently inherited.
If a round, green seeded pea plant (RR yy) is crossed with wrinkled, yellow seeded pea plant, (rr YY) the seeds produced in F1 generation are
What are the components of the DNA molecule?
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.
