Heredity and Variation Test 2

Total Questions:50 Total Time: 60 Min



Questions 1 of 50

Question:Mendel is called the father of:

Answers Choices:




None of these

Questions 2 of 50

Question:The term gene which was coined by Johannsen was termed by Mendel as:

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Active principle


Questions 3 of 50

Question:Terms 'genotype' and 'phenotype' were introduced by:

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Questions 4 of 50

Question:Hybrids are those offsprings which possess:

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both contrasting alleles though only one is evident

only one contrasting character

characters of either parent

characters which are not separated in next generations

Questions 5 of 50

Question:The offsprings of mating between two different pure strains are called:

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P generation



Questions 6 of 50

Question:The year 1900 AD is highly significant for geneticists due to:

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discovery of genes

discovery of blood groups

chromosome theory of heredity

rediscovery of Mendelism

Questions 7 of 50

Question:Mendel's work was rediscovered in:

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Questions 8 of 50

Question:In 1900 AD three biologists independently discovered Mendel's principles. They are:

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de Vries, Correns and Tschermak

Bateson, Punnett and Bridges

Avery, MacLeod and McCarthy

Sutton, Morgan and Bridges

Questions 9 of 50

Question:Mendel obtained wrinkled seeds in pea due to deposition of sugars instead of starch. It was due to:

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absence of starch branching enzyme

Questions 10 of 50

Question:Monohybrid cross involves:

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Individual with parent

Individuals different in one trait

Individuals different in two traits

Individuals with two different parents

Questions 11 of 50

Question:When two alleles are brought together in a hybrid, one of them expresses itself completely at the expense of the second. It is due to Mendel's:

Answers Choices:

Law of segregation

Law of dominance

Law of purity of gametes

Law of independent assortment

Questions 12 of 50

Question:A homozygous red flowered pea plant is 'crossed with homozygous white-flowered pea plant. The offspring would be:

Answers Choices:

50% red flowered

50% pink flowered

all pink flowered

all red floweied

Questions 13 of 50

Question:Percentage of heterozygous individuals obtained from selfing of Rr individuals is:

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Questions 14 of 50

Question:A heterozygous round seeded plant is crossed to recessive wrinkled seeded plant. The progeny would be:

Answers Choices:

20 rounded : 99 wrinkled

99 rounded : 301 wrinkled

301 rounded : 100 wrinkled

303 rounded : 301 wrinkled

Questions 15 of 50

Question:If an organism is crossed with homozygous recessive individual, it is:

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Back cross


Monohybrid cross


Questions 16 of 50

Question:When a heterozygous round seeded plant is crossed with recessive wrinkled seeded plant, the wrinkled phenotypes will appear in the ratio:

Answers Choices:

1 : 2

2 : 1

1 : 1

3 : 1

Questions 17 of 50

Question:To determine heterozygosity or homozygosity a plant must be crossed with:

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Homozygous dominant

Heterozygous dominant

Questions 18 of 50

Question:tt mates with Tt. What will be characteristic of offspring?

Answers Choices:

All dominant

25% recessive

50% recessive

75% recessive

Questions 19 of 50

Question:The allele which is unable to express its effect in the presence of another is called:

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Questions 20 of 50

Question:Appearance of a hidden character in some progeny of \({{\rm{F}}_{\rm{2}}}\) proclaims the law of:

Answers Choices:

Purity of gametes

Law of dominance

Law of segregation

Both (1) and (3)

Questions 21 of 50

Question:Mendel's law of independent assortment can be demonstrated by:

Answers Choices:

Test cross

Monohybrid cross

Back cross

Dihybrid cross

Questions 22 of 50

Question:Dihybrid cross is related to:

Answers Choices:

Law of purity of gametes

Law of segregation

Law of dominance

Law of independent assortment

Questions 23 of 50

Question:In the \({F_2}\) generation of a dihybrid cross in pea plants, tall red, tall white, dwarf red and dwarf white are obtained in the ratio:

Answers Choices:

1 : 3 : 9 : 3

1 : 9 : 3 : 3

9 : 3 : 3 : 1

9 : 1 : 1 : 3

Questions 24 of 50

Question:Female AaBb is crossed with male AAbb. The gametes shall be:

Answers Choices:

Female AB, Ab, aB and ab, male Ab

Female Aa, Bb, AB and ab, male Ab

Female AB, ab, Ab and aB, male AA, bb

Female Aa and Bb, male Ab

Questions 25 of 50

Question:From a cross AABb x aaBb, the genotypes AaBB, AaBb, Aabb, aabb will be obtained in the following ratio:

Answers Choices:

1 : 1 : 1 : 1

1 : 2 : 1 : 0

0 : 3 : 1 : 0


Questions 26 of 50

Question:In a dihybrid cross AABB x aabb, \({{\rm{F}}_{\rm{2}}}\)progeny of AABB, AABb, AaBB and AaBb occurs in the ratio of:

Answers Choices:

1 : 1 : 1 : 1

9 : 3 : 3 : 1

1 : 2 : 2 : 4

1 : 2 : 2 : 1

Questions 27 of 50

Question:In a cross between AABB x aabb, the ratio of \({{\rm{F}}_{\rm{2}}}\) genotypes between AABB, AaBB, Aabb and aabb would be:

Answers Choices:

9 : 3 : 3 : 1

1 : 2 : 2 : 1

2 : 1 : 1 : 2

7 : 5 : 3 : 1

Questions 28 of 50

Question:A trihybrid cross is made between two yeasts; both with genotypes AaBbCc. What proportion of the offspring will be of the genotype aabbcc?

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Questions 29 of 50

Question:How many different kinds of gametes can be produced by an organism of the genotype AaBBCc?

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Questions 30 of 50

Question:How many types of gametes can be produced by an animal of the genotype AabbCC?

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Questions 31 of 50

Question:The term 'Phenocopy' was introduced by:

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Questions 32 of 50

Question:In shorthorn cattle genes for red (ri) and white (r2) coat colour occur. Crosses between red (rin) and white (r2r2) produces (rlr2) roan. This is an example of:

Answers Choices:

Incomplete dominance



Complementary genes

Questions 33 of 50

Question:A, B, O blood group system is due to:

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Multiple factor inheritance

Incomplete dominance

Multiple allelism

Questions 34 of 50

Question:Multiple alleles control inheritance of:

Answers Choices:

Blood groups

Sickle-cell anaemia


Colour blindness

Questions 35 of 50

Question:Blood grouping in human beings is controlled by:

Answers Choices:

3 alleles in which none is dominant

4 alleles in which A is dominant

3 alleles in which A and B are codominant and i is recessive

3 alleles in which B is dominant

Questions 36 of 50

Question:A gene which affects the character of another gene, not located on the similar locus of the homologous chromosome is: 

Answers Choices:

Duplicate gene

Complementary gene

Epistatic gene

Supplementary gene

Questions 37 of 50

Question:The ratio 9 : 7 is due to:

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Lethal genes

Supplementary genes

Complementary genes

Epistatic genes

Questions 38 of 50

Question:Nonallelic genes, having similar phenotypic effect, interact to produce a different trait and ratio of 9 : 7 in \({{\rm{F}}_{\rm{2}}}\) generation are:

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Supplementary genes

Epistatic genes

Hypostatic genes

Complementary genes

Questions 39 of 50

Question:Recessive lethal genes are:

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killer in homozygous state

causative for appearance of ancestral traits

genes present on different chromosomes but influencing single trait

none of these

Questions 40 of 50

Question:A pleiotropic gene is one which:

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affects one character

affects more than one character

supplements effect of another gene

requires another gene for its expression

Questions 41 of 50

Question:Pleiotropic gene has:

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Multiple genotypes

Single genotype

Single phenotype

Multiple effects

Questions 42 of 50

Question:Epistasis implies:

Answers Choices:

one pair of gene can completely mask the expression of another pair of genes

one pair of genes independendy controls a particular phenotype

one pair of genes enhances the phenotypic expression of another pair of genes

many genes collectively control a particu­lar phenotype

Questions 43 of 50

Question:Genetically dwarf plant can be converted into a plant of normal height with the help of:

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Questions 44 of 50

Question:A cross between two pairs of alleles is called:

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dihybrid cross

crossing over

monohybrid cross

Questions 45 of 50

Question:Pure line breed refers to:

Answers Choices:

heterozygosity and linkage

homozygosity and independent assortment

heterozygosity only

homozygosity only

Questions 46 of 50

Question:Which one of the following is more likely to be heterozygous?

Answers Choices:

cross-pollinated crops


self-pollinated crops

pure lines

Questions 47 of 50

Question:In human beings, multiple genes are involved in the inheritance of:

Answers Choices:

Sickle-cell anaemia

Colour blindness

Skin colour


Questions 48 of 50

Question:Which of the following pairs on hybridization produces 1 : 1 phenotypic ratio?

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Tt, tt

TT, Tt

TT, tt

None of these

Questions 49 of 50

Question:Which type of gametes are produced by RrYy?

Answers Choices:

ry, ry, rY, ry

RY, RY, rY, rY

RY, Ry, rY, ry


Questions 50 of 50

Question:A cross involving \({F_1}\) hybrid and a double recessive parent is called:

Answers Choices:

test cross

dihybrid cross

multiple cross

monohybrid cross