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Free download in PDF Principles of Inheritance and Variation Objective Type Questions and Answers for competitive exams. These short objective type questions with answers are very important for Board exams as well as competitive exams like NEET, AIIMS, JIPMER etc. These short solved questions or quizzes are provided by Gkseries./p>
(1)
Linked genes may be separated by
[A]
Gene mutation
[B]
Polyploidy
[C]
Segregation
[D]
Crossing over
(2)
Crossing over in diploid organism is responsible for
[A]
Recombination of linked gene
[B]
Segregation of alleles
[C]
Dominance of genes
[D]
Linkage between genes
Answer: Segregation of alleles
(3)
Crossing over takes place between
[A]
Sister chromatids of homologous chromosomes
[B]
Non sister chromatids of homologous chromosomes
[C]
Sisters of non-homologous chromosomes
[D]
DNA and RNA
Answer: Non sister chromatids of homologous chromosomes
(4)
If the distance between genes on a chromosome is more , the linkage strength is
[A]
More
[B]
Less
[C]
Unaffected
[D]
More in somatic cells
(5)
Drosophila melanogaster has
[A]
2 pairs of autosomes and 1 pair of sex chromosomes
[B]
3 pairs of autosomes and 1 pair of sex chromosomes
[C]
1 pair of autosomes and 3 pairs of sex chromosomes
[D]
2 pairs of autosomes and 2 pairs of sex chromosomes
Answer: 2 pairs of autosomes and 2 pairs of sex chromosomes
(6)
A trisomic individual has a chromosomal number of
[A]
2n -1
[B]
2n +2
[C]
2n + 1
[D]
2n + 3
(7)
Among the following which one is the best chemical for inducing the polyploidy?
[A]
Ethylene
[B]
Colchicine
[C]
Acridines
[D]
Mustard gas
(8)
Down’s syndrome is an example of
[A]
Monosomy
[B]
Trisomy
[C]
Triploidy
[D]
Eupolyploidy
(9)
Which of the following is 6x (hexaploid) wheat?
[A]
Triticum durum
[B]
T. monococcum
[C]
T.aestivum
[D]
Triticale
(10)
The holandric genes are located on
[A]
Mitochondria
[B]
X- chromosome
[C]
Y-chromosome
[D]
Polytene chromosome
(11)
If the haploid number of chromosomes in a plant is 12,then the number of chromosomes in monosomic is
[A]
22
[B]
23
[C]
25
[D]
26
(12)
Alleles are paired in
[A]
In zygote
[B]
In diploid organism
[C]
Dihybrid
[D]
All of these
(13)
Inheritance of flower colour is an example of incomplete dominance, which is seen in:
[A]
Antirrhinum
[B]
Pisum
[C]
Solanum
[D]
Hibiscus
(14)
Haemophilia most likely originated as a result of
[A]
The separation of two homologous chromosomes
[B]
A non disjunction of chromosome number 21
[C]
The crossing over to two sex chromosomes
[D]
A gene mutation in the X- chromosome
Answer: A gene mutation in the X- chromosome
(15)
Chromosome complement with 2n-1 is called as
[A]
Monosomy
[B]
Trisomy
[C]
Nullisomy
[D]
Tetrasomy
(16)
The most striking example of point mutation is found in a disease called
[A]
Night blindness
[B]
Turners syndrome
[C]
Down’s syndrome
[D]
Sickle cell anemia
Answer: Sickle cell anemia
(17)
In which of the following, females are heterogametic
[A]
Humans
[B]
Grasshopper
[C]
Drosophila
[D]
Fowl
(18)
Gynaecomastia is a common feature seen in:
[A]
Down’s syndrome
[B]
Turner’s syndrome
[C]
Cystic fibrosis
[D]
Klinefelter’s syndrome
Answer: Klinefelter’s syndrome
(19)
XO type of sex determination is seen in:
[A]
Man
[B]
Grasshopper
[C]
Drosophila
[D]
Birds
(20)
Which of the following is not a Mendelian disorder?
[A]
Haemophilia
[B]
Cystic fibrosis
[C]
Thalesemia
[D]
Turner’s syndrome
Answer: Turner’s syndrome
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