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Free download in PDF Principles of Inheritance and Variation Multiple Choice Questions with 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)
Which principle of inheritance was not given by Mendel
[A]
Independent assortment
[B]
Dominance
[C]
Purity of gametes
[D]
Linkage
(2)
When dominant BB and recessive bb is crossed, the percentage of progeny showing the parental genotype is
[A]
0%
[B]
25%
[C]
50%
[D]
75%
(3)
The year 1900AD is highly significant for genetics due to
[A]
Chromosome theory of heredity
[B]
Discovery of genes
[C]
Rediscovery of Mendelism
[D]
Principle of linkage
Answer: Chromosome theory of heredity
(4)
The process by which the segregation of Mendelian factors takes place is
[A]
Hybridisation
[B]
Mitosis
[C]
Meiosis
[D]
Fertilisation
(5)
Which would most probably be the genetic makeup of the parents of a colour blind daughter?
[A]
Carrier mother and normal father
[B]
Carrier mother and color blind father
[C]
Color blind mother and normal father
[D]
Normal mother and normal father
Answer: Carrier mother and normal father
(6)
If a heterozygous tall plant is crossed with a homozygous dwarf plant the proportion of dwarf progeny will be
[A]
25%
[B]
50%
[C]
75%
[D]
100%
(7)
When two tall plants are crossed 45 tall plants and 14 dwarf plants are obtained.The genotype of parent plants is
[A]
TT x TT
[B]
TT x tt
[C]
Tt x Tt
[D]
TT x Tt
(8)
Which of the following is not a dominant character selected by Mendel in Pisum?
[A]
Yellow pod color
[B]
Violet flower colour
[C]
Axillary flowers
[D]
Yellow seed colour
(9)
Variation can occur due to
[A]
Mutations
[B]
Recombination
[C]
Fertilisation
[D]
All of these
(10)
Who discovered the phenomenon of incomplete dominance in Mirabilis and Antirrhinum?
[A]
De Vries
[B]
Bateson
[C]
Carl Correns
[D]
Davenport
(11)
How many types of gametes are produced by a trihybrid?
(12)
A dihybrid heterozygous tall plant with round seed is crossed with a similar genotype, what percentage of plants should posses Tt Rr genotype?
[A]
6.25%
[B]
12.5%
[C]
25%
[D]
75%
(13)
A cross by changing the source of ovum is
[A]
Back cross
[B]
Test cross
[C]
Monohybrid
[D]
Reciprocal cross
Answer: Electrical and chemical
(14)
When the phenotypic and genotypic ratios resemble in the F2 generation it is an example of
[A]
Independent assortment
[B]
Qualitative inheritance
[C]
Segregation
[D]
Incomplete dominance
Answer: Qualitative inheritance
(15)
In what situation, the phenotype of a dihybrid cross would exhibit parental combination of characters in more than the expected value and recombination in less than the expected value?
[A]
When genes are in mitochondria
[B]
When duplicate genes are present
[C]
When genes are linked
[D]
When supplementary genes are present
Answer: When genes are in mitochondria
(16)
When the dihybrid Tt rr plants are self-fertilized, what percentage of descendants would be heterozygous for one character and homozygous for another?
[A]
25%
[B]
50%
[C]
75%
[D]
100%
(17)
In a double heterozygous plant, (Eg: Aa Bb) four types of gametes are produced .This illustrate the law of
[A]
Dominance
[B]
Segregation
[C]
Purity of gametes
[D]
Independent assortment
Answer: Independent assortment
(18)
Back cross with recessive parent is called
[A]
Monohybrid cross
[B]
Multiple cross
[C]
Single cross
[D]
Test cross
(19)
If a gene has multiple effects, it is called
[A]
Multiple allelism
[B]
Pleiotropism
[C]
Polygeny
[D]
Epistasis
(20)
Maize has 10 pairs of chromosomes. How many linkage groups should it possess
[A]
5
[B]
10
[C]
20
[D]
40
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