Principles of Inheritance and Variation

Given below are two statements: one is labelled as Assertion (A) and the other is labelled as Reason (R). In the light of the above statements, choose the most appropriate answer from the options given below:

1. A is not correct but R is correct
2. Both A and R are correct and R is the correct explanation of A
3. Both A and R are correct but R is not the correct explanation of A
4. A is correct but R is not correct

Which one of the following can be explained on the basis of Mendel's Law of Dominance? Choose the correct answer from the options given below:

1. A, B and C only
2. A, C, D and E only
3. B, C and D only
4. A, B, C, D and E

In a plant, black seed color (BB/Bb) is dominant over white seed color (bb). In order to find out the genotype of the black seed plant, with which of the following genotype will you cross it?

1. BB
2. bb
3. Bb
4. BB/Bb

Match List I with List II Choose the correct answer from the options given below:

1. A-I, B-II, C-III, D-IV
2. A-II, B-I, C-III, D-IV
3. A-III, B-IV, C-I, D-II
4. A-IV, B-III, C-II, D-I

Given below are two statements: In the light of the above statements, choose the correct answer from the options given below :

1. Both Statement I and Statement II are correct
2. Both Statement I and Statement II are incorrect
3. Statement I is correct but Statement II is incorrect
4. Statement I is incorrect but Statement II is correct

The production of gametes by the parents, formation of zygotes, the F1 and F2 plants, can be understood from a diagram called :

1. Net square
2. Bullet square
3. Punch square
4. Punnett square

How many true breeding pea plant varieties did Mendel select as pairs, which were similar except in one character with contrasting traits?

1. 14
2. 4
3. 2
4. 8

Select the correct statement :

1. Franklin Stahl coined the term “linkage”.
2. Punnett square was developed by a British scientist.
3. Spliceosomes take part in translation.
4. Transduction was discovered by S. Altman.

Which one from those given below is the period for Mendel's hybridisation experiments ?

1. 1870 – 1877
2. 1857 – 1869
3. 1840 – 1850
4. 1856 – 1863

Among the following characters, which one was not considered by Mendel in his experiments on pea?

1. Stem-Tall or dwarf
2. Pod-Inflated or constricted
3. Trichomes-Glandular or non-glandular
4. Seed-Green or yellow

A tall true breeding garden pea plant is crossed with a dwarf true breeding garden pea plant. When the F1 plants were selfed the resulting genotypes were in the ratio of -

1. 3 : 1 :: Tall : Dwarf
2. 1 : 2 : 1 :: Tall heterozygous : Tall homozygous : Dwarf
3. 1 : 2 : 1 :: Tall homozygous : Tall heterozygous : Dwarf
4. 3 : 1 :: Dwarf : Tall

A true breeding plant is -

1. produced due to cross-pollination among unrelated plants
2. one that is able to breed on its own
3. near homozygous and produces offspring of its own kind
4. always homozygous recessive in its genetic constitution

Alleles are

1. true breeding homozygotes
2. different phenotype
3. heterozygotes
4. different molecular forms of a gene

How many pairs of contrasting characters in pea plants were studied by Mendel in his experiments?

1. Eight
2. Five
3. Seven
4. Six

A test cross is carried out to :

1. Determine whether two species or varieties will breed successfully
2. Determine the genotype of a plant at F2
3. Predict whether two traits are linked
4. Assess the number of alleles of a gene

Test cross in plants or in Drosophila involves crossing:

1. the F1 hybrid with a double recessive genotype
2. between two genotypes with dominant trait
3. between two F1 hybrids
4. between two genotypes with recessive trait

A cross in which an organism showing a dominant phenotype is crossed with the recessive parent in order to know its genotype is called -

1. Dihybrid cross
2. Back cross
3. Monohybrid cross
4. Test cross

The genotype of a plant showing the dominant phenotype can be determined by –

1. Pedigree analysis
2. Back cross
3. Test cross
4. Dihybrid cross

Which one of the following cannot be explained on the basis of Mendel's Law of Dominance?

1. Out of one pair of factors one is dominant, and the other recessive
2. Alleles do not show any blending and both the characters recover as such in F2 generation
3. The discrete unit controlling a particular character is called a factor
4. Factors occur in pairs

In pea plants, yellow seeds are dominant to green. If a heterozygous yellow seeded plant is crossed with a green seeded plant, what ratio of yellow and green seeded plants would you expect in F1 generation?

1. 9 : 1
2. 3 : 1
3. 50 : 50
4. 1 : 3

A common test to find the genotype of a hybrid is by:-

1. Crossing of one F1 progeny with recessive parent
2. Crossing of one F2 progeny with female parent
3. Crossing of one F2 progeny with male parent
4. Studying the sexual behaviour of F1 progenies

Phenotype of an organism is the result of-

1. Environmental changes and sexual dimorphism
2. Cytoplasmic effects and nutrition
3. Genotype and environment interactions
4. Mutations and linkages

Which one of the following traits of garden pea studied by Mendel was a recessive feature?

1. Green seed colour
2. Green pod colour
3. Axial flower position
4. Round seed shape

Two crosses between the same pair of genotypes or phenotypes in which the sources of the gametes are reversed in one cross, is known as:

1. Reciprocal cross
2. Reverse cross
3. Test cross
4. Dihybrid cross

On selfing a plant of F1 generation with genotype “AABbCC”, the phenotypic ratio in F2 generation will be

1. 1 : 1
2. 3 : 1
3. 9 : 3 : 3 : 1
4. 27 : 9 : 9 : 9 : 3 : 3 : 3 : 1

A gene is said to be dominant if : -

1. It is expressed only in heterozygous condition
2. It expresses its effect only in homozygous stage
3. It is never expressed in any condition
4. It is expressed both in homozygous and heterozygous condition

According to mendelism which character is showing dominance?

1. Green colour in seed coat
2. Wrinkled seed
3. Terminal position of flower
4. Green pod colour