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प्रश्न
Why are the traits acquired during the life time of an individual not inherited? Explain.
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उत्तर
Acquired traits (like muscle built by exercise or a scar) arise from environmental effects on an individual’s somatic cells and do not change the DNA of gametes. Because inheritance depends on alterations in the germ line, somatic modifications are not passed to offspring, this is the Weismann barrier separating soma and germ line. Lamarck’s idea that acquired characters are inherited was thus disproved; only genetic changes (mutations) or stable germ-line epigenetic marks can be inherited, and these are rare. Therefore, traits acquired during life are generally not transmitted to the next generation.
संबंधित प्रश्न
How did Mendel interpret his results to show that traits may be dominant or recessive? Describe briefly.
A study found that children with light-coloured eyes are likely to have parents with light-coloured eyes. On this basis, can we say anything about whether the light eye colour trait is dominant or recessive? Why or why not?
What type of plants were used by Mendel for conducting his experiments on inheritance?
For his experiments on heredity, Mendel used :
papaya plants
potato plants
pea plants
pear plants
In humans, if gene B gives brown eyes and gene b gives blue eyes. What will be the colour of eyes of the persons having the following combination of genes?
(a) Bb
(b) bb
(c) BB
Only one of the following characteristic of the parents can be inherited by their children. This one is:
Mendel, in one of his experiments with pea plants, crossed a variety of pea plant having round seeds with one having wrinkled seeds. State Mendel’s observations giving reasons of F1 and F2 progeny of this cross. Also, list any two contrasting characters, other than round seeds of pea plants that Mendel used in his experiments.
Who is the pioneer of modern genetics?
Mendel crossed pea plants with two pairs of contrasting characters.
| RRYY | × |
rryy |
| Round, Yellow | Wrinkled, Green |
He observed 4 types of combinations in F2 generation. Which of the combinations were new? Write the conclusion drawn by this experiment.
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.
