This practice test includes 25 multiple choice Questions from class 12th chapter - Principles of inheritance and variation.
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Q.1.
A recessive allele is expressed in
- heterozygous condition only
- homozygous condition only
- F3 generation
- both homozygous and heterozygous conditions.
Answer:
(b) homozygous condition only
Explanation: It is expressed in homozygous condition only.
Explanation: It is expressed in homozygous condition only.
Q.2.
The characters which appear in the first filial generation are called
- recessive characters
- dominant characters
- holandric characters
- lethal characters
Answer:
(b) dominant characters
Explanation: These characters are called dominant characters
Explanation: These characters are called dominant characters
Q.3.
What will be the distribution of phenotypic features in the first filial generation after a cross between a homozygous female and a heterozygous male for a single locus ?
- 3:01
- 1:02:01
- 1:01
- None of the above
Answer:
(c) 1:01
Q.4.
In a monohybrid cross between two heterozygous individuals, percentage of pure homozygous individuals obtained in F1 generation will be
- 25%
- 50%
- 75%
- 100%
Answer:
(b) 50%
Q.5.
What is the probability of production of dwarf offsprings in a cross betweeen two heterozygous tall pea plants ?
- Zero
- 50%
- 25%
- 100%
Answer:
(c) 25%
Explanation: The probability of production of dwarf offsprings in a cross betweeen two heterozygous tall pea plants is 25%
Explanation: The probability of production of dwarf offsprings in a cross betweeen two heterozygous tall pea plants is 25%
Q.6.
Which of the following crosses will give tall and dwarf pea plants in same proportions ?
- TT × tt
- Tt × tt
- TT × Tt
- tt × tt
Answer:
(b) Tt × tt
Explanation: Tt × tt will give tall and dwarf pea plants in same proportions
Explanation: Tt × tt will give tall and dwarf pea plants in same proportions
Q.7.
Which of the following is incorrect regarding ZW – ZZ type of sex determination ?
- It occurs in birds and some reptiles.
- Females are homogametic and males are heterogametic.
- 1:1 sex ratio is produced in the offsprings
- All of these
Answer:
(b) Females are homogametic and males are heterogametic.
Explanation: Females are homogametic and males are heterogametic is incorrect.
Explanation: Females are homogametic and males are heterogametic is incorrect.
Q.8.
A couple has six daughters. What is the possibility of their having a girl next time ?
- 10%
- 50%
- 90%
- 100%
Answer:
(b) 50%
Explanation: Probability is 50 %.
Explanation: Probability is 50 %.
Q.9.
Number of autosomes present in liver cells of a human female is
- 22 autosomes
- 22 pairs
- 23 autosomes
- 23 pairs
Answer:
(b) 22 pairs
Explanation: autosomes present in liver cells of a human female is 22 pairs
Explanation: autosomes present in liver cells of a human female is 22 pairs
Q.10.
Haplodiploidy is found in
- grasshoppers and cockroaches
- birds and reptiles
- butterflies and moths
- honeybees, ants and waspe.
Answer:
(d) honeybees, ants and waspe.
Explanation: Haplodiploidy is found in honeybees, ants and waspe.
Explanation: Haplodiploidy is found in honeybees, ants and waspe.
Q.11.
Rate of mutation is affected by
- temperature
- X rays
- gamma rays
- all of these
Answer:
(d) all of these
Explanation: all of these
Explanation: all of these
Q.12.
Two or more independent genes present on different chromosomes which determine nearly same phenotype are called
- supplementary genes
- complementary genes
- duplicate genes
- none of these
Answer:
(c) duplicate genes
Explanation: It is known as duplicate genes
Explanation: It is known as duplicate genes
Q.13.
Select the incorrect statement regarding pedigree analysis
- Solid symbols show unaffected individuals
- Proband is the person from which case history starts
- It is useful for genetic counsellors
- It is an analysis of traits in several generations of a family
Answer:
(a) Solid symbols show unaffected individuals
Explanation: Solid symbols show affected individuals
Explanation: Solid symbols show affected individuals
Q.14.
To determine the genotype of a tall plant of F2 generation, Mendel crossed this plant with a dwarf plant. This cross represents a
- test cross
- back cross
- reciprocal cross
- dihybrid cross
Answer:
(a) test cross
Explanation: This cross represents a test cross.
Explanation: This cross represents a test cross.
Q.15.
Mendal formulated the law of purity of gametes on the basis of
- monohybrid cross
- dihybrid cross
- test cross
- back cross
Answer:
(a) monohybrid cross
Explanation: law of purity of gametes was based on monohybrid cross
Explanation: law of purity of gametes was based on monohybrid cross
Q.16.
The inheritance of flower colour in Antirrhinum (dog flower) is an example of
- incomplete dominance
- co-dominance
- multiple alleles
- linkage
Answer:
(a) incomplete dominance
Explanation: Flower colour in Antirrhinum (dog flower) is an example of incomplete dominance
Explanation: Flower colour in Antirrhinum (dog flower) is an example of incomplete dominance
Q.17.
Phenotypic and genotypic ratio is similar in case of
- complete dominance
- incomplete dominance
- over dominance
- epistasis
Answer:
(b) incomplete dominance
Q.18.
What can be the blood group of offspring when both parents have AB blood group ?
- AB only
- A, B and AB
- A, B, AB and O
- A and B only
Answer:
(b) A, B and AB
Q.19.
Inheritance of roan coat in cattle is an example of
- incomplete dominance
- codominance
- multiple allelism
- none of these
Answer:
(b) codominance
Q.20.
How many types of gametes can be produced by a diploid organism who is heterozygous for 4 loci ?
- 4
- 8
- 16
- 32
Answer:
(c) 16
Explanation: It can produce 16 gametes.
Explanation: It can produce 16 gametes.
Q.21.
Law of independent assortment can be explained with the help of
- dihybrid
- test cross
- back cross
- monohybrid cross
Answer:
(a) dihybrid
Explanation: It can be explained by dihybrid cross
Explanation: It can be explained by dihybrid cross
Q.22.
Which three scientists independently rediscovered Mendel’s work ?
- Avery, McLeod, McCarty
- Sutton, Morgan and Bridges
- Bateson, Punnet and Bridges
- de Vries, Correns and Tschemark
Answer:
(d) de Vries, Correns and Tschemark
Explanation: Three scientists were de Vries, Correns and Tschemark.
Explanation: Three scientists were de Vries, Correns and Tschemark.
Q.23.
Chromosomal theory of inheritance was given by
- Morgan et al
- Sutton and Boveri
- Hugo deVries
- Gregor J. Mendel
Answer:
(b) Sutton and Boveri
Explanation: This theory was given by Sutton and Boveri.
Explanation: This theory was given by Sutton and Boveri.
Q.24.
Experimental verification of ‘chromosomal theory of inheritance’ was done by
- Sutton and Boveri
- Morgan et al
- Henking
- Karl Correns
Answer:
(b) Morgan et al
Q.25.
Genes located very close to one another on same chromosome tend to be transmitted together and are called as
- allelomorphs
- identical genes
- linked genes
- recessive genes
Answer:
(c) linked genes
Explanation: It is called as linked genes.
Explanation: It is called as linked genes.
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