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Gregor Mendel conducted hybridisation experiments

(A) Seven years (1865-1872)

(B) Seven years (1856-1863)

(C) Seven years (1853-1860)

(D) Fourteen years (1853-1867)

PRINCIPLES OF INHERITANCE AND VARIATIONU

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Sahiwal cow in ...a... was developed by ...b...

(A) a-Punjab, b-Natural Selection and Domestication

(B) a-Haryana, b-Natural Selection and Artificial Selection

(C) a-Haryana, b-Artificial Selection and Domestication

(D) a-Punjab, b-Artificial Selection and Domestication.


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Occasionally, a single gene may express more than one

effect. This is

(A) Polygenic inheritance

(B) Pleiotropy

(C) Multiple allelism

(D) Co-dominance.


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Which of the following is not a correct dominant-recessive trait

pairs of Pisum sativum

(A) Axial-terminal flower position, Tall-dwarf stem height

(B) Yellow-green pod colour, round-wrinkled seed shape

(C) Full-constricted pod shape,Yellow-green seed colour

(D) Violet-white flower colour, Inflated-constricted pod shape.


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Biological unit controlling heredity is

(A) Genome

(B) Chromosome

(C) Genotype

(D) Gene.


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Variations found in offspring are important component of

(A) Genetics

(B) Speciation

(C) Species fixation

(D) Heredity.


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Test cross is a cross between

(A) Hybrid × Dominant parent (Tt × TT)

(B) Hybrid × Recessive parent (Tt × tt)

(C) Hybrid × Hybrid (Tt × Tt)

(D) All of the above.


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The term genetics was proposed by

(A) Johannsen

(B) Morgan

(C) Mendel

(D) Bateson.


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A gamete normally contains

(A) Many alleles of a gene

(B) All alleles of a gene

(C) Two alleles of a gene

(D) One allele of a gene.


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Branch of biology dealing with heredity & variations is

(A) Ecology

(B) Evolution

(C) Palaeontology

(D) Genetics.


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Phenotype of an organism is the result of

(A) Mutations and linkages

(B) Genotype and environmental interactions

(C) Cytoplasmic effects and nutrition

(D) Environmental changes and sexual dimorphism.


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Word genetics comes from

(A) Gene

(B) Genesis

(C) Genome

(D) Genomics.


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Genes controlling seven traits in Pea studied by Mendel

were actually located on

(A) Seven chromosomes

(B) Six chromosomes

(C) Four chromosomes

(D) Five chromosomes.


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In Pea, wrinkling of seeds is due to non-formation of

starch because of the absence of enzyme

(A) Amylase

(B) Invertase

(C) Branching enzyme

(D) Diastase.


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Father of human genetics is

(A) Curvier

(B) Bateson

(C) Mendel

(D) Garrod


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Genes which code for a pair of contrasting traits are

known as

(A) Cistron

(B) Allele

(C) Exon

(D) Intron


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Alleles are

(A) Similar forms of different gene

(B) Slightly different forms of the different gene

(C) Similar forms of the same gene

(D) Slightly different forms of the same gene


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In Punnett square, the possible gametes are written on two

sides, usually the

(A) Top row and left columns

(B) Top row and right columns

(C) Bottom row and right columns

(D) Bottom row and left columns.


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Punnett square was developed by

(A) British Zoologist, Reginald C. Punnett

(B) German Botanist, Reginald C. Punnett

(C) Stanford Geneticist Reginald C. Punnett

(D) British Geneticist Reginald C. Punnett


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In the case of Antirrhinum sp. the recessive trait is seen in

progenies due to the

(i) The normal enzyme

(ii) Less-efficient enzyme

(iii) Non-functional enzyme

(iv) No enzyme at all.

Select the correct option among i-iv :

(A) ii, iii (B) iii, iv

(C) i, iii (D) i, ii.


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The proportion of 3 : 1 at the F2 generation is explained by

the

(A) Law of Dominance

(B) Law of Segregation

(C) Law of Independent assortment

(D) Test cross.


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In Mendelian dihybrid cross, how many are recombinants

(A) 37.2 %

(B) 62.8 %

(C) 37.5 %

(D) 62.5 %.


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Starch synthesis in the pea seed is controlled by one gene. It

has two alleles B and b. If starch grain size is considered as

the phenotype, then from this angle allele show

(A) Multiple allele

(B) Incomplete Dominance

(C) Co-dominance

(D) Polygenic inheritance.


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In incomplete dominance, the ratio which not deviates

from the mendelian monohybrid cross

(A) Genotypic ratio

(B) Phenotypic ratio

(C) Both A and B

(D) Either A or B.


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Which is correct

(A) Each back cross is test cross

(B) Each test cross is back cross

(C) Crossing F2 with F1 is called test cross

(D) Crossing F2 with either parent is called test cross


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A cross between black flowered plant and white flowered

plant yielded gray flowered plants. The phenomenon is

(A) Codominance

(B) Pseudominance

(C) Incomplete dominance

(D) Epistasis.


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27


Mendel proposed something was being stably passed

down unchanged from parents to offspring called

(A) Genes

(B) Genotype

(C) Factors

(D) Alleles.


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28


Sexually reproducing organisms contribute in their

offspring

(A) All of the genes

(B) One half of their genes

(C) One fourth of their genes

(D) Double the number of genes.


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Mendel’s principle of segregation is based on separation of

alleles during

(A) Gamete formation

(B) Seed formation

(C) Pollination

(D) Embryonic development.


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O group mother with O group child sues AB group man

for fathership of child. What is true

(A) The claim is correct

(B) Father is true but mother is not

(C) Both parent are false

(D) Mother is true but father claimed is wrong.


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Genes located on same locus but having different

expressions are

(A) Multiple alleles

(B) Oncogenes

(C) Polygenes

(D) Codominants.


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Blood grouping in human beings is controlled by

(A) 4 alleles in which IA is dominant

(B) 3 alleles in which IA and IB codominant and i is

recessive

(C) 3 alleles in which none is dominant

(D) 3 alleles in which i is dominant.


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Sickle cell anaemia is an example of

(A) Epistasis

(B) Codominance

(C) Pleiotropy

(D) Incomplete dominance.


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The allele which is unable to express its effect

(A) Co-dominant

(B) Supplementary

(C) Complementary

(D) Recessive.


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Incomplete dominance was discovered by

(A) Correns

(B) Mendel

(C) Johannsen

(D) Bateson.


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A polygenic inheritance in human beings is

(A) Skin colour

(B) Phenylketonuria

(C) Colour blindness

(D) Sickle cell anaemia.


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Human skin colour is polygenic trait with each dominant

determining a part of melanin deposition while the recessive

are coding for no melanin. If a very dark skinned person

marries a very light skinned women, the chances of a very

dark skinned offspring are

(A) 1/64 (B) 1/4

(C) 5/8 (D) 9/64.


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How many types of gametes will be produced by

individuals of AABbcc genotype

(A) Two

(B) Four

(C) Six

(D) Eight.


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In heterozygous condition, both the alleles express in

(A) Colour blindness

(B) AB blood group

(C) Rh factor

(D) A and B blood types.


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Inheritance of blood group is a condition of

(a) Codominance (b) Incomplete dominance

(c) Multiple allelism (d) Dominance

(A) a, b and c (B) b and d

(C) a, c and d (D) b and c.


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In a polygenic cross Aa Bb Cc × Aa Bb Cc, the phenotypic

ratio offspring is 1 : 6 : ‘X’ : 20 : 'X' : 6 : 1. What is the

value of ‘X’.

(A) 7

(B) 9

(C) 15

(D) 25.


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The chromosome movement during meiosis had been

worked out by the year

(A) 1865

(B) 1900

(C) 1902

(D) 1891.


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43


Who argued that the pairing and separation of a pair of

chromosomes would lead to the segregation of a pair of

factors they carried

(A) Sutton and Boveri

(B) T.H. Morgan

(C) Alfred Sturtevant

(D) Both B and C


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In the Morgan's experiment on Drosophila, the strength of

linkage between y and w is

(A) Higher than w and m

(B) Lower than w and m

(C) Same as w and m

(D) Can't be predicted.


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In Mendelian dihybrid cross the yellow and green colour

of seed is segregated in the ratio of

(A) 3 : 1

(B) 10 : 6

(C) 9 : 4

(D) 9 : 7.


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If a pea plant produces 2560 seed during a dihybrid cross

between round-yellow and wrinkled-green plant. Then how

many seed are wrinkled-yellow, round yellow and wrinkled-

green respectively

(A) 640, 480, 1280 (B) 480, 1440, 160

(C) 640, 1280, 320 (D) 160, 1440, 480


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In Drosophila melanogaster the genes white and yellow

shows ........a.......recombination and genes white and

miniature wing shows ......b........linkage

(A) a→ 98.7%, b→ 37.2%

(B) a→ 98.7%, b→ 62.8%

(C) a→ 1.3%, b→ 37.2%

(D) a→ 1.3%, b→ 62.8%.


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Carl Correns, a rediscoverer of Mendel’s work belongs to

(A) Austria

(B) Germany

(C) Holland

(D) Denmark.


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Who used frequency of recombination between gene pairs

on the same chromosome as a measure of distance

between genes and mapped their position on chromosome

(A) Alfred Sturtevant (B) Gregor Mendel

(C) Correns (D) Tschermak.


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Experimental verification of chromosomal theory of

inheritance was given by

(A) Thomas Hunt Morgan

(B) Gregor Johann Mendel

(C) Hugo de Vries

(D) Langdon Down.


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Match the genetic phenomena with their respective ratios

a. Inhibitory gene ratio 1. 9 : 3 : 4

b. Complementary gene ratio 2. 1 : 1 : 1 : 1

c. Recessive epistasis ratio 3. 12 : 3 : 1

d. Dihybrid test cross ratio 4. 13 : 3

e. Dominant epistasis ratio 5. 9 : 7

(A) a - 5, b - 4, c - 3, d - 2, e - 1

(B) a - 4, b - 5, c - 1, d - 2, e - 3

(C) a - 1, b - 2, c - 4, d - 3, e - 5

(D) a - 2, b - 1, c - 4, d - 5, e - 3.


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Genetic maps of chromosomes are based on the

frequency of

(A) Non-disjunction

(B) Translocation

(C) Linkage

(D) Genetic recombination.


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Linkage was discovered by

(A) Blakeslee

(B) Sutton

(C) Muller

(D) Bateson and Punnet


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54


Linkage in plants was first shown in

(A) Zea mays

(B) Lathyrus odoratus

(C) Oenothera lamarckiana

(D) Pisum sativum


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Genotypic ratio of a dihybrid cross is

(A) 1 : 4 : 6 : 4 : 1

(B) 9 : 3 : 3 : 1

(C) 1 : 2 : 1

(D) 1 : 2 : 2 : 4 : 1 : 2 : 1 : 2 : 1.


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Mendel studied seven pair of contrasting traits in Pea plant Which

are correct option in given alternatives?

(A) 2 character flower based, 2 colour based, 3 seed based, 1

height based

(B) 2 character flower based, 1 height based, 2 seed based, 2

pod based

(C) 3 colour based, 1 flower based, 3 height based

(D) 3 Character pod based, 2 stem based,1 height based, 3 colour

based


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Recognise the figure given below and

select the correct option

(A) a-Male Drosophila, b-Female

Drosophila

(B) a-Female Drosophila, b-Male

Drosophila

(C) a-Male housefly, b-Female

housefly

(D) a-Female housefly, b-Male

housefly.


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In the following dihybrid cross

conducted by Morgan the parental

type and recombinant type are

respectively

(A) 98.7 %, 1.3 %

(B) 1.3 %, 98.7 %

(C) 62.8 %, 37.2 %

(D) 37.2 %, 62.8 %.


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In Mirabilis jalapa, RR, Rr and rr determine red, pink and

white colours respectively. When F1 hybrid of RR and rr

was crossed with dominant parent, the ratio produced is

(A) All red

(B) 2 Red : 2 Pink

(C) All white

(D) 2 Pink : 2 white


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Which is incorrect in Mendelian characters?

Character Dominant Recessive

(A) Pod colour Green Yellow

(B) Seed shape Round Wrinkled

(C) Flower position Terminal Axial

(D) Shape of pod Full Constricted


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In a case of incomplete dominance, true breeding red

flowered plant (RR) is crossed with true breeding white

flowered plant (rr). What would be correct F2 ratio?

(A) 1 red : 2 pink : 1 white

(B) 3 red : 1 white

(C) 1 red : 1 pink : 2 white

(D) 2 red : 1 pink : 1 white


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Drosophila melanogaster find very suitable for genetic studies because

(i) They could be grown in simple synthetic medium in the laboratory.

(ii) They complete their life-cycle in about 14 days.

(iii) A single mating could produce a large number of progenies.

(iv) Male and females are clearly distinguishable.

(v) It has few hereditary variations that can be seen with high power

microscopes.

Select how many are correct statement?

(1) 5 (2) 4

(3) 2 (4) 3


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In the case of Antirrhinum sp., the recessive trait is seen in

progenies due to the

(i) The normal enzyme

(ii) Less-efficient enzyme

(iii) Non-functional enzyme

(iv) No enzyme at all

Select the correct option among i-iv.

(A) ii , iii (B) iii, iv

(C) i, iii (D) i, ii


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Person having genotype IA IB would show the blood

group as AB. This is because of

(A) Pleiotropy

(B) Co-dominance

(C) Segregation

(D) Incomplete dominance


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A polygenic inheritance in human beings is

(A) Skin colour

(B) Phenylketonuria

(C) Colour blindness

(D) Sickle cell anaemia


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Blood grouping in human beings is controlled by

(A) 4 alleles in which IA is dominant

(B) 3 alleles in which IA and IB are codominant & i is

recessive

(C) 3 alleles in which none is dominant

(D) 3 alleles in which IA is dominant


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Occasionally, a single gene may express more than

one effect. This is

(A) Polygenic inheritance

(B) Pleiotropy

(C) Multiple allelism

(D) Co-dominance


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Phenylketonuria is genetic disorder caused by a defect

in metabolism of

(A) Fatty acids

(B) Polysaccharides

(C) Amino acids

(D) Vitamins


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An unfertilized human ovum has

(A) Two X chromosomes

(B) X and Y chromosomes

(C) X in some and Y in others

(D) Only one X-chromosome


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Amino acid substituted in sickle cell anaemia is

(A) Glutamic acid for valine in alpha chain

(B) Glutamic acid for valine in beta chain

(C) Valine for glutamic acid in alpha chain

(D) Valine for glutamic acid in beta chain


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Incomplete dominance is found in

(A) Neurospora crassa

(B) Lathyrus odoratus

(C) Pisum sativum

(D) Antirrhinum/Mirabilis


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Read the following statements.

(i) Morgan carried out several monohybrid crosses in Drosophila to study

genes that were sexlinked.

(ii) Morgan attributed that proportion of parental gene combination is less

than the non-parental type due to the physical association.

(iii) Term recombination was coined by Morgan to describe the generation of

non-parental gene combinations.

(iv) Alfred Sturtevent used the frequency of linkage between gene pairs on

the same chromosome and find genetic map.

Select that how many are incorrect statement?

(1) 3 (2) 1

(3) 4 (4) 2


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When both alleles express their effect on being present

together, the phenomenon is called

(A) Dominance

(B) Codominance

(C) Pseudo dominance

(D) Incomplete dominance


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In the following figure the female is inflicted with

(A) A monosomic disorder

(B) A trisomic disorder

(C) A mendelian disorder

(D) A polyploid disorder


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White and miniature wing showed

(A) 1.3 % Recombination

(B) 37.2 % Linkage

(C) 98.7 % Linkage

(D) 62.8 % Linkage


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