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Free download in PDF Principles of Inheritance and Variation Short 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)
Who put forward the crossing theory of recombination
[A]
Gregor Mendel
[B]
Wiliam Bateson
[C]
Janssen
[D]
T.H.Morgan
(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)
(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%
(4)
Mutation of any single gene maybe
[A]
Micromutation
[B]
Point mutation
[C]
Gene mutation
[D]
All of these
(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%
(6)
Thallasemia beta is located on
[A]
11th chromosome
[B]
16th chromosome
[C]
9th chromosome
[D]
12th chromosome
(7)
Choose the sex influenced trait
[A]
Ovary in female
[B]
Hypertrichosis
[C]
Haemophilia
[D]
Pattern baldness
(8)
Clotting factors VIII is absent in
[A]
Haemophilia A
[B]
Haemophiia B
[C]
Thalassamia beta
[D]
Both (a) and (b)
(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
(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
(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%
(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
(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
(19)
Experimental proof for chromosome theory of inheritance is given by
[A]
Sutton
[B]
Sutton and Bovery
[C]
T H Morgan
[D]
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
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