9 Principles of Inheritance and Variation Objective Type Questions and Answers | Principles of Inheritance and Variation Quiz

Principles of Inheritance and Variation MCQs | Principles of Inheritance and Variation Objective Type Questions and Answers

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Questions
1 Linked genes may be separated by
A Gene mutation
B Polyploidy
C Segregation
D Crossing over

Answer:Segregation
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

Answer:Less
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

Answer:2n +2
7 Among the following which one is the best chemical for inducing the polyploidy?
A Ethylene
B Colchicine
C Acridines
D Mustard gas

Answer:Ethylene
8 Down’s syndrome is an example of
A Monosomy
B Trisomy
C Triploidy
D Eupolyploidy

Answer:Trisomy
9 Which of the following is 6x (hexaploid) wheat?
A Triticum durum
B T. monococcum
C T.aestivum
D Triticale

Answer:T.aestivum
10 The holandric genes are located on
A Mitochondria
B X- chromosome
C Y-chromosome
D Polytene chromosome

Answer:X- 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

Answer: 23
12 Alleles are paired in
A In zygote
B In diploid organism
C Dihybrid
D All of these

Answer: Dihybrid
13 Inheritance of flower colour is an example of incomplete dominance, which is seen in:
A Antirrhinum
B Pisum
C Solanum
D Hibiscus

Answer: Solanum
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

Answer: 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

Answer:Humans
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

Answer:Man
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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