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Principles of Inheritance and Variation MCQs | Principles of Inheritance and Variation Multiple Choice Questions with Answers

Questions
1 Which principle of inheritance was not given by Mendel
A Independent assortment
B Dominance
C Purity of gametes
D Linkage

Answer:Dominance
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%

Answer: 25%
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

Answer: Meiosis
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%

Answer: 50%
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

Answer: 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

Answer:Axillary flowers
9 Variation can occur due to
A Mutations
B Recombination
C Fertilisation
D All of these

Answer:Fertilisation
10 Who discovered the phenomenon of incomplete dominance in Mirabilis and Antirrhinum?
A De Vries
B Bateson
C Carl Correns
D Davenport

Answer: Carl Correns
11 How many types of gametes are produced by a trihybrid?
A 3
B 4
C 8
D 16

Answer:4
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%

Answer: 25%
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%

Answer: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

Answer: Test cross
19 If a gene has multiple effects, it is called
A Multiple allelism
B Pleiotropism
C Polygeny
D Epistasis

Answer: Pleiotropism
20 Maize has 10 pairs of chromosomes. How many linkage groups should it possess
A 5
B 10
C 20
D 40

Answer:10

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