Which one of the following can be explained on the basis of Mendel’s Law of Dominance? [2024]
A. Out of one pair of factors one is dominant and the other is recessive.
B. Alleles do not show any expression and both the characters appear as such in generation.
C. Factors occur in pairs in normal diploid plants.
D. The discrete unit controlling a particular character is called factor.
E. The expression of only one of the parental characters is found in a monohybrid cross.
Choose the correct answer from the options given below:
A, B and C only
A, C, D and E only
B, C and D only
A, B, C, D and E
(2)
According to Mendel’s law of dominance:
(i) Characters are controlled by discrete units called factors.
(ii) Factors occur in pairs.
(iii) Out of the two factors (alleles), only one expresses itself in the hybrid (heterozygous) as well as homozygous state called dominant and prevents the expression of another factor which is called recessive.
The law is used to explain the expression of only one of the parental characters in a monohybrid cross in the generation and the expression of both in the generation.
Given below are two statements: [2022]
Statement I: Mendel studied seven pairs of contrasting traits in pea plants and proposed the laws of inheritance.
Statement II: Seven characters examined by Mendel in his experiment on pea plants were seed shape and colour, flower colour, pod shape and colour, flower position and stem height.
In the light of the above statements, choose the correct answer from the options given below:
Both Statement I and Statement II are correct
Both Statement I and Statement II are incorrect
Statement I is correct but Statement II is incorrect
Statement I is incorrect but Statement II is correct
How many true breeding pea plant varieties did Mendel select as pairs, which were similar except in one character with contrasting traits? [2020]
4
2
14
8
(3)
Mendel conducted artificial pollination or cross pollination experiments using several true-breeding pea lines. He selected 14 true-breeding pea plant varieties, as pairs which were similar except for one character with contrasting traits. Some of the contrasting traits selected were smooth or wrinkled seeds, yellow or green seeds, inflated (full) or constricted green or yellow pods and tall or dwarf plants.
Among the following characters, which one was not considered by Mendel in his experiments on pea? [2017]
Trichomes-Glandular or non-glandular
Seed-Green or yellow
Pod-Inflated or constricted
Stem-Tall or dwarf
(1)
Mendel considered the following characters of pea in his experiments:
| Character | Dominant | Recessive | |
| (i) | Seed shape | Round (R) | Wrinkled (r) |
| (ii) | Seed cotyledon colour | Yellow (Y) | Green (y) |
| (iii) | Flower colour | Violet (V) | White (v) |
| (iv) | Pod shape | Inflated (I) | Constricted (i) |
| (v) | Pod colour | Green (G) | Yellow (g) |
| (vi) | Flower position | Axial (A) | Terminal (a) |
| (vii) | Stem height | Tall (T) | Dwarf (t) |
Which one from those given below is the period for Mendel’s hybridisation experiments? [2017]
1840-1850
1857-1869
1870-1877
1856-1863
(4)
Mendel carried out hybridisation experiments on garden pea for 7 years from 1856–1863.
In his classic experiments on pea plants, Mendel did not use [2015]
seed shape
flower position
seed colour
pod length
(4)
Mendel considered the following characters of pea in his experiments:
| Character | Dominant | Recessive | |
| (i) | Seed shape | Round (R) |
|
| (ii) | Seed cotyledon colour | Yellow (Y) | Green (y) |
| (iii) | Flower colour | Violet (V) | White (v) |
| (iv) | Pod shape | Inflated (I) | Constricted (i) |
| (v) | Pod colour | Green (G) | Yellow (g) |
| (vi) | Flower position | Axial (A) | Terminal (a) |
| (vii) | Stem height | Tall (T) | Dwarf (t) |
How many pairs of contrasting characters in pea plants were studied by Mendel in his experiments? [2015]
Eight
Seven
Five
Six
