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

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Questions
1 How many type of phenotypes possible for ABO blood group
A 1
B 2
C 3
D 4

Answer:1
2 A person affected with phenylketonuria , lacks an enzyme that converts the amino acid phenylalanine into
A Valine
B Proline
C Histidine
D Tyrosine

Answer:Valine
3 Haemophilia in man is due to
A Sex-linked inheritance
B Sex-limited inheritance
C Sex-influenced inheritance
D Primary non-disjunction

Answer: Primary non-disjunction
4 In XO type of sex determination
A Females produce two different types of gametes
B Males produce two different types of gametes
C Females produce gametes with Y chromosome
D Males produce single type of gametes

Answer:Males produce two different types of gametes
5 Which one of the following cannot be explained on the basis of Mendel’s Law of Dominance?
A Factors occur in pairs
B The discrete unit controlling a particular character is called a factor
C Out of one pair of factors one is dominant , and the other recessive
D Alleles do not show any blending and both the characters recover as such in F2 generation

Answer: The discrete unit controlling a particular character is called a factor
6 The genotype of a plant showing the dominant phenotype can be determined by :
A Back cross
B Test cross
C Dihybrid cross
D Pedigree analysis

Answer:Pedigree analysis
7 Which one of the following conditions correctly describes the manner of determining the sex in the given example?
A XO condition in humans as found in Turner syndrome , determines female sex
B Homozygous sex chromosomes (XX) produce male in Drosophila
C XO type of sex chromosomes determine male sex in grasshopper
D Homozygous sex chromosomes (ZZ) determine female sex in birds

Answer:Homozygous sex chromosomes (XX) produce male in Drosophila
8 F2 generation in a Mendelian cross showed that both genotypic and phenotypic ratios are same as 1:2:1. It represents a case of
A Monohybrid cross with complete dominanace
B Monohybrid cross with incomplete dominance
C Co-dominance
D Dihybrid cross

Answer:Monohybrid cross with incomplete dominance
9 Alleles which can express only in pair with similar allele is
A Dominant
B Recessive
C Co dominant
D Lethal

Answer: CNS
10 Among the following traits that Mendel studied , choose the recessive one
A Yellow pods
B Axile flower
C Terminal flower
D Green seed

Answer: Axile flower
11 When a dominant ‘AA’ and a recessive ‘aa’ are crossed percentage of the progenies showing the parental genotypes will be
A 0%
B 25%
C 50%
D 100%

Answer: 100%
12 A normal visioned man whose father was colour blind ,marries a women whose father is also colour blind . They have their first child as a daughter . What are the chances that this child would be colour blind?
A 25%
B 50%
C 100%
D 0%

Answer: 50%
13 The incorrect statement with regard to Haemophilia is
A It is a recessive disease
B It is sex linked disease
C It is a dominant disease
D A single protein involved in the clotting of blood is affected

Answer: A single protein involved in the clotting of blood is affected
14 Person with blood group AB is considered as universal recipient because he has
A Both A and B antibodies in the plasma
B No antigen on RBC and no antibody in the plasma
C Both A and B antigens in the plasma but no antibodies in the plasma
D Both A and B antigens on RBC but no antibodies in the plasma

Answer: Both A and B antigens on RBC but no antibodies in the plasma
15 A patient with unknown blood group needs immediate blood transfusion. The group that can be donated will be
A Blood group O
B Blood group AB
C Blood group A
D Blood group B

Answer:Blood group A
16 Which Mendelian idea is depicted by a cross in which the F1 generation resembles both parents
A Incomplete dominance
B Inheritance of 1 gene
C Co-dominance
D Multiple allelism

Answer:Co-dominance
17 An F2 hybrid generation will have
A 4 types of genotypes
B 7 types of genotypes
C 9 types of genotypes
D 16 types of genotypes

Answer:16 types of genotypes
18 Who among the following is not concerned with re-discovery of Mendelism
A Von Tschermak
B Carl Correns
C Theodre Bovery
D Hugode Vries

Answer: Hugode Vries
19 The diploid number of drosophila melanogaster
A 8
B 10
C 11
D 12

Answer: 8
20 Linkage phenomenon explained first by
A William Batson
B T.H.Morgan
C Alfsed Sturtevent
D Johanson

Answer: William Batson

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