Principles of Inheritance and Variation MCQs | Principles of Inheritance and Variation Short Questions and Answers

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Questions
1 Who put forward the crossing theory of recombination
A Gregor Mendel
B Wiliam Bateson
C Janssen
D T.H.Morgan

Answer:Gregor Mendel
2 In honeybees
A The males have only one set of chromosomes
B The males have single sex chromosomes
C Males produce projeny by parthenogenesis
D Both (a) and (c)

Answer: Both (a) and (c)
3 First child of a normal couple is phenylketouric. The probability of second male child is affected will be
A 0%
B 25%
C 50%
D 100%

Answer:0%
4 Mutation of any single gene maybe
A Micromutation
B Point mutation
C Gene mutation
D All of these

Answer:Gene mutation
5 A normal man whose father was haemophilic marries a women whose father was haemophilic. They have their first child as daughter. What is the chance that this could be
A 25%
B 50%
C 0%
D 100%

Answer: 0%
6 Thallasemia beta is located on
A 11th chromosome
B 16th chromosome
C 9th chromosome
D 12th chromosome

Answer:11th chromosome
7 Choose the sex influenced trait
A Ovary in female
B Hypertrichosis
C Haemophilia
D Pattern baldness

Answer:Haemophilia
8 Clotting factors VIII is absent in
A Haemophilia A
B Haemophiia B
C Thalassamia beta
D Both (a) and (b)

Answer:Thalassamia beta
9 Pedigree analysis is useful for
A Study of inheritance when arranged mating is not possible
B Study of sex linked inheritance in man
C Study of Mendelian disorders in man
D All of these

Answer: Study of inheritance when arranged mating is not possible
10 Choose the incorrect statement regarding haemophilia
A It is x –linked
B It is dominant in male
C it inherit from father to daughter
D A single protein in cascade of several protiens involved in clotting is affected

Answer: it inherit from father to daughter
11 Choose the wrong statement
A Mental retardation can be the effect of phenyl pyruvic acid
B Thallasemia is a quantitative problem
C Sickle cell anemia person produce abnormal Hb
D Cystic fibrosis is quantitative

Answer:Sickle cell anemia person produce abnormal Hb
12 Which of the following cannot be detected in developing foetus by amniocentesis
A Klinefelter syndrome
B Sex of the foetus
C Down syndrome
D Jaundice

Answer: Down syndrome
13 Which mendelian idea is depicted by a cross in which the F1 generation resembles both the parents?
A Incomplete dominance
B Law of dominance
C Inheritance of one gene
D Co- dominance

Answer:Co- dominance
14 If both parents are carriers of thalassemia , which is an autosomal recessive disorder , what are the chance of pregnancy resulting in an affected child?
A No chance
B 50%
C 25%
D 100%

Answer: 50%
15 A human female with Turner’s syndrome
A Has one additional X chromosome
B Exhibits male characters
C Is able to produce children with normal husband
D Has 45 chromosomes with XO

Answer: Exhibits male characters
16 Which of the following cannot be expected on the basis of Mendel’s law of dominance
A It explains the expression of one of the parental traits in F 1
B It explain expression of both traits in F 2
C It explains the 3:1 ratio in F 2
D It explains the formation of functional enzyme by dominant allele

Answer:It explain expression of both traits in F 2
17 When heterozygous yellow round seed plants and self-fertilized, the frequency of occurrence of RrYY genotype among the offspring’s is
A 1/16
B 3/16
C 2/16
D 4/16

Answer:1/16
18 A person homozygous for autosomal loci ‘a’ and ‘b’ and heterozygous for gene ‘p’ shall produce how many types of gametes in respect of these loci
A 1 type
B 2 types
C 3 types
D 4 types

Answer: 2 types
19 Experimental proof for chromosome theory of inheritance is given by
A Sutton
B Sutton and Bovery
C T H Morgan
D Sturtevent

Answer: Sturtevent
20 The nuclear structure observed by Henking in 50% of the sperms in the testes of a insect was termed
A X-body
B Bar body
C Polar body
D Chromatin

Answer: Polar body

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