Advertisements
Advertisements
प्रश्न
Explain Mendel’s law of independent inheritance. Give one example.
Advertisements
उत्तर
Mendel’s law of independent assortment states that
-
When two pairs of traits are combined in a hybrid, one pair of character segregates independent of the other pair of character.
-
In a dihybrid cross between two plants having round yellow (RRYY) and wrinkled green seeds (rryy), four types of gametes (RY, Ry, rY, ry) are produced. Each of these segregate independent of each other, each having a frequency of 25% of the total gametes produced.
APPEARS IN
संबंधित प्रश्न
In a monohybrid cross between tall pea plants (TT) and short pea plants (tt), a scientist obtained only tall pea plants (Tt) in the F1 generation. However, on selfing the F1 generation pea plants, he obtained both tall and short plants in F2 generation. On the basis of above observations with other angiosperms also, can the scientist arrive at a law? If yes, explain the law. If not, give justification for your answer.
Mendel said that the characteristics or traits of organisms are carried from one generation to the next by internal factors which occur in pairs. What is the modern name for these factors?
Using height (tallness/dwarfness) of a plant as an example, show that genes control the characteristics or traits in an organism.
What is the genotype of dwarf plants which always produced dwarf offspring?
What sizes of plants are produced if both parents have genes Tt?
Pure-bred round-yellow pea seeds have genotype RRYY and the pure-bred wrinkled-green pea seeds have genotype rryy. Keeping this in mind, write the phenotypes of the following genotypes of hybrid pea seeds :
(a) Rryy
(b) rrYy
(c) rrYY
(d) RrYy
(e) RRyy
One of the following traits cannot be inherited. This one is:
"It is possible that a trait is inherited but may not be expressed." Give a suitable example to justify this statement.
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.
Name the following:
The basic units of heredity.
