Match List I with List II and select the correct answer using the codes given the lists. List-I List-II a. Autotetraploid $$1$$. Triticum aestivum b. Ac-Ds system $$2$$. Drosophila melanogaster c. Segmental allopolyploid $$3$$. Secale cereale d. Genetic Cinderella $$4$$. Zea mays

A-$$3$$, B-$$4$$, C-$$1$$, D-$$2$$

A-$$2$$, B-$$1$$, C-$$4$$, D-$$3$$

A-$$3$$, B-$$1$$, C-$$4$$, D-$$2$$

A-$$2$$, B-$$4$$, C-$$1$$, D-$$3$$

Match List-I(Type of chromosomal aberration) with List-II(Designation) and select the correct answer using the codes given the lists. List-I List-II a. One chromosome pair extra to the normal complement $$(2n+2)$$ $$1$$. Trisomic b. One chromosome extra to the normal complement $$(2n+1)$$ $$2$$. Monosomic c. One chromosome less than the normal complement $$(2n-1)$$ $$3$$. Terasomic d. One chromosome pair less than the normal complement $$(2n-2)$$ $$4$$. Nullisomic

A-$$2$$, B-$$4$$, C-$$3$$, D-$$1$$

A-$$1$$, B-$$3$$, C-$$2$$, D-$$4$$

A-$$3$$, B-$$1$$, C-$$4$$, D-$$2$$

A-$$3$$, B-$$1$$, C-$$2$$, D-$$4$$

MCQ Questions for Class 12 Medical Biology Principles Of Inheritance And Variation Quiz 10

$2n-2$ is

0%
Monosomic
0%
Trisomic
0%
Nullisomic
0%
Haploid

Walter Sutton is famous for his contribution to.

0%
Chromosomal theory of inheritance
0%
Genetic engineering
0%
Totipotency
0%
Quantitative genetics

Polyploid formed by two different species is called

0%
Autopolyploid
0%
Allopolyploid
0%
Triploid
0%
Monoploid

Which is incorrect regarding pedigree analysis?

0%
It helps to understand whether the trait in question is dominant or recessive
0%
It confirms that the trait is linked to one of the autosomes
0%
It helps to trace the inheritance of a specific trait
0%
It confirms that DNA is the carrier of genetic information

Choose the wrong statement.

0%
In grasshoppers, besides autosomes, males have only one X-chromosome whereas females have a pair of X-chromosomes
0%
In XY type of sex determination, both males and female have same number of chromosomes
0%
In Drosophila, males have one X-and one Y-chromosome whereas females have a pair of X-chromosomes besides autosomes
0%
In birds, females have one Z-and one W-chromosomes, whereas males have a pair of Z-chromosomes besides autosomes
0%
In insects with XO type of sex determination, all sperms have X-chromosomes besides autosomes

Sex determination by chromosomes in human and Drosophila is through.

0%
XX-XY
0%
XX-XO
0%
ZZ-ZW
0%
Both A and B

Sickle cell anaemia results due to mutation caused by

0%
Substitution
0%
Insertion
0%
Deletion
0%
Duplication

Conditions of karyotype

$2n+1-1$ and

$2n+1-2$ are called.

0%
Aneuploidy
0%
Monosomy
0%
Autopolyploidy
0%
Polyploidy

Explanation

Failure of segregation of chromatids during cell division cycle results in the gain or loss of a chromosome called aneuploidy. Aneuploidy arises due to the non-disjunction of the homologous chromosome.

Aneuploidy is of four types:

Monosomy =

$2n – 1$

Nullisomy =

$2n – 2$

Trisomy =

$2n + 1$

Tetrasomy =

$2n + 2$

Autopolyploidy is an additional set of chromosomes, which may be from a parent or identical parental species.
Polyploids in which there are more than two chromosome sets. It is by 3n (triploid), 4n (tetraploid), 5n (pentaploid).
So,option A is correct.

Which of the following conditions correctly describes the manner of determining the sex in a given example?

0%
XO condition in humans as found in Klinefelter's syndrome determines female sex
0%
Homozygous sex chromosomes ZZ determines female sex in birds
0%
XO type of sex determines male sex in grasshopper
0%
Homozygous sex chromosomes XX produce male in Drosophila

In our society women are blamed for producing a female child. Choose the correct answer for sex determination in humans due to

0%
Some defect like aspermia in man
0%
Genetic make up of particular sperm which fertilizes the egg
0%
Genetic make up of egg
0%
Some defect in reproductive system of women

A Drosophila has XXXYY sex chromosomes. All the autosomal chromosomes are normal. The sexual phenotype will be.

0%
Normal female
0%
Super female
0%
Intersexual
0%
Male

Match the columns and choose the correct option.

0%
i-c, ii-a, iii-b, iv-e, v-d
0%
i-b, ii-a, iii-f, iv-c, v-d
0%
i-c, ii-d, iii-a, iv-e, v-b
0%
i-c, ii-a, iii-f, iv-e, v-d
0%
i-d, ii-c, iii-b, iv-f, v-a

In this human pedigree the filled symbols represent the affected individuals. Identify the type of this pedigree.

0%
Autosomal dominant
0%
X-linked recessive
0%
Autosomal recessive
0%
X-linked dominant

In which female has a pair of XX chromosomes?

0%
Drosophila
0%
Butterfly
0%
Bulbul
0%
Peafowl

In haploids the monohybrid ratio is

0%
$3:1$
0%
$1:1$
0%
$1:2:1$
0%
$15:1$

Who discovered that chromosome number is fixed for a species.

0%
Winiwater
0%
Hertwig
0%
Van Beneden
0%
Boveri

Identify the scientists from the hints given: (i) They used chromosome movement to explain Mendel's laws. (ii) They noted that behaviour of chromosomes was parallel to the behaviour of genes.

0%
Morgan and Correns
0%
De Vries and Boveri
0%
Bridges and Correns
0%
Bridges and Sutton
0%
Sutton and Boveri

Who suggested for the first time that genes are located on the chromosomes?

0%
Boveri
0%
Sutton
0%
Morgan
0%
Strasbueger

Choose the correct statements regarding genetic disorders.
(i) Turner's female is a result of aneuploidy
(ii) Tritanopia is a sex-linked recessive disorder
(iii) Haemophilia c follows criss cross pattern of inheritance
(iv) Sickle cell anaemia is due to mutation of alleles in chromosome.

0%
i, iii, iv
0%
ii, iii
0%
i, iii
0%
ii, iv

Choose the correct statements with reference to mutation theory :
(a) Mutations occur from time to time in naturally breeding population.
(b) Mutations are continuous and accumulate over generations.
(c) Mutations are full fledged and there are no intermediate forms.
(d) Mutations are not subjected to natural selection.

0%
(b) and (c)
0%
(a) and (b)
0%
(c) and (d)
0%
(a) and (c)

Stevens

$(1902)$ discovered.

0%
m-chromosomes
0%
Y-chromosomes
0%
L-chromosomes
0%
B-chromosomes

Explanation

$\textbf{Correct option: }$ B

$\textbf{Solution: }$

$\textbf{Option (a) }$

$\bullet$ Nettie Maria Stevens was a geneticist who discovered sex chromosomes (X and Y chromosome).

$\bullet$ She observed the production of male sperms containing one with a larger chromosome and the other with the smaller chromosomes.

$\bullet$ This observation was later studied and depicted as the sex chromosome (X and Y chrmosome).

$\bullet$ This pair of choromosome is considered important in organism which is responsible for determining sex of an new individual.

Hence, the correct option is (b).

From the pedigree chart of a family, one can make an analysis that it is on.

0%
Autosomal dominant trait
0%
Autosomal recessive trait
0%
Allosomal dominant trait
0%
Allosomal recessive trait

Chromosome theory of inheritance was proposed by.

0%
Sutton and Boveri independently
0%
Sutton and Boveri jointly
0%
Boveri and Brauer independently
0%
Boveri and Brauer jointly

Chromosome theory of linkage was proposed by.

0%
Morgan and Castle
0%
Sutton
0%
Boveri
0%
Bridges

A dihybrid plant with genotype PpNn. It produces four types of gametes in following number PN=200 , pn=200 , Pn=800 , pN=800 then what is the distance linked genes ?

0%
30 cM
0%
10 cM
0%
25 cM
0%
20 cM

A diploid population having individuals with different chromosome numbers ranging from

$2n+3$ to

$2n-3$ is a.

0%
Polyploidy
0%
Ditriploid
0%
Ancuploid
0%
Trainload

Turner's syndrome does not occur in males

$(44+Y)$ because.

0%
An ovum is seldom devoid of X-chromosome
0%
A male sperm does not penetrate X-deficient ovum
0%
Foetus with $44+Y$ complement dies
0%
Unexplained

Super males were discovered by.

0%
Turner
0%
Down
0%
Klinefelter
0%
Hauschika

Haploids are more suitable for mutation studies because

0%
Haploids are more abundant than diploid
0%
Haploids are reproductively more stable
0%
All mutations whether dominant or recessive are expressed in haploids
0%
Mutagens penetrate haploid more effectively than diploids.

In a typical monohybrid cross, plants to which generation show same phenotype and genotype.

0%
Parental generation
0%
First filial generation
0%
Second filial generation
0%
Third filial generation

Sickle cell anaemia is a case of _____________.

0%
Silent mutation
0%
Transversion
0%
Frame shift mutation
0%
None of these

The hybrid ratio

$9:3:4$ comes in case/s of _________________.

0%
Recessive epistasis ratio
0%
Supplementary gene ratio
0%
Both (a) and (b)
0%
Dominant epitasis

Same genotypic and phenotypic ratio as

$1:1$ is found in which of the following type of cross?

0%
Monohybrid test cross
0%
Dihybrid test cross
0%
Monohybrid out cross
0%
Dihybrid out cross

Which of the following is true for progenies of

$F_4$ generation of monohybrid cross?

0%
$6.25\%$ pure $93.75\%$ impure
0%
$6.25\%$ impure and $93.75\%$ pure
0%
$12.5\%$ pure $87.5\%$ hybrid
0%
$12.5\%$ hybrid $87.5\%$ pure

With reference to sex determination in Melandrium album, consider the following statements.

a. The Y chromosome is longer than the X chromosome.

b. The Y chromosome and X chromosome form a heteromorphic bivalent at meiosis.

c. It is the presence of a single Y chromosome rather than any number of X chromosomes or autosomes that give a male individual.

Which of the statements give are correct?

0%
$1$ and $2$ only
0%
$2$ and $3$ only
0%
$1$ and $3$ only
0%
$1, 2$ and $3$

Duplication of chromosomes without cell or nuclear division gives rise to the condition of.

0%
Polyploidy
0%
Politely
0%
Haploid
0%
Diploid

Which one of the following phenomena leads to aneuploidy?

0%
Improper division of centromere
0%
Desynapsos
0%
Asynapsis
0%
Non-disjunction

The phenomena of coupling and repulsion was explained by ________________.

0%
Bateson and Punnett
0%
Beadle and Tatum
0%
Bridges
0%
Morgan

Triticum aestivum, a common wheat is?

0%
Autopolyploid
0%
Auto diploid
0%
Allotetraploid
0%
Allohexaploid

Polyploidy will exhibit polysomic inheritance, only if they _______________.

0%
Are allopolyploids
0%
Lack multivalent formation
0%
Are autopolyploid and form multivalent
0%
Are amphidiploids

Which one of the following pairs is NOT correctly matched?

0%
Blackarm- Phymatoirichum omnivoriuim
0%
Root rot- Rhizoctonia solani
0%
Angular leaf spot- Puccinia stakmanii
0%
Wilt-Fusarium oxysporum sp. Vasinfectum

A man can inherit his X-chromosome from his ____________.

0%
maternal grandmother or maternal rgrandfather
0%
father
0%
maternal grandfather
0%
paternal grandfather
0%
paternal grandmother

Match List I(Postulates) with List II(scientists) and select the correct answer using the codes given.

List-I	List-II
a. Inheritance of the acquired characters	$1$ . Hugo de Vries
b. Multiplication of individual species in geometrical proportion	$2$ . Julian Huxley
c. Mutation theory of evolution	$3$ . Jean Baptiste Lamarck

0%
A- $1$ , B- $2$ , C- $3$
0%
A- $2$ , B- $3$ , C- $1$
0%
A- $3$ , B- $1$ , C- $2$
0%
A- $3$ , B- $2$ , C- $1$

Which one of the following discoveries provided the strongest evidence for the chromosome theory of heredity?

0%
Discovery of sex chromosomes
0%
Discovery of polyploidy
0%
Discovery of giant chromosomes
0%
Discovery of supernumerary chromosomes

Nucleosome is an ellipsoidal bead-like structure with a length of

$110$ A and a diameter of

$65$ to

$75$ A. Its core consists of an octamer of his tones and its surface is surrounded by a super-helical strand of DNA of about.

0%
$110$ base pairs
0%
$140$ base pairs
0%
$210$ base pairs
0%
$265$ base pairs

Match List I with List II and select the correct answer using the codes given the lists.

List-I	List-II
a. Autotetraploid	$1$ . Triticum aestivum
b. Ac-Ds system	$2$ . Drosophila melanogaster
c. Segmental allopolyploid	$3$ . Secale cereale
d. Genetic Cinderella	$4$ . Zea mays

0%
A- $3$ , B- $4$ , C- $1$ , D- $2$
0%
A- $2$ , B- $1$ , C- $4$ , D- $3$
0%
A- $3$ , B- $1$ , C- $4$ , D- $2$
0%
A- $2$ , B- $4$ , C- $1$ , D- $3$

Match List-I(Type of chromosomal aberration) with List-II(Designation) and select the correct answer using the codes given the lists.

List-I	List-II
a. One chromosome pair extra to the normal complement $(2n+2)$	$1$ . Trisomic
b. One chromosome extra to the normal complement $(2n+1)$	$2$ . Monosomic
c. One chromosome less than the normal complement $(2n-1)$	$3$ . Terasomic
d. One chromosome pair less than the normal complement $(2n-2)$	$4$ . Nullisomic

0%
A- $2$ , B- $4$ , C- $3$ , D- $1$
0%
A- $1$ , B- $3$ , C- $2$ , D- $4$
0%
A- $3$ , B- $1$ , C- $4$ , D- $2$
0%
A- $3$ , B- $1$ , C- $2$ , D- $4$

Which one of the following procedures is to be adopted to eliminate an undesirable penetrate heredity trait from an otherwise superior variety?

0%
Unprogressive hybridization
0%
Chemical application
0%
Changing agronomic proactive
0%
X-ray irradiation

The concept about the origin of life has changed in the recent past and it is now believed that it was an RNA world which led to the origin of life. This belief is based on the discovery that RNA.

0%
Can be used for the synthesis of DNA, using the reverse transcriptase enzyme.
0%
Can work as an enzyme
0%
Is used as mRNA, tRNA and rRNA during protein synthesis
0%
Is used as a genetic material in some viruses

The absence of Y chromosome in human beings causes _____________.

0%
Turner's syndrome
0%
Klinefelter's sydrome
0%
Down's syndrome
0%
No abnormality

CBSE Questions for Class 12 Medical Biology Principles Of Inheritance And Variation Quiz 10 - MCQExams.com

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Practice Class 12 Medical Biology Quiz Questions and Answers

CBSE Questions for Class 12 Medical Biology Principles Of Inheritance And Variation Quiz 10 - MCQExams.com

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Practice Class 12 Medical Biology Quiz Questions and Answers

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