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1 of 25
Q.1 A recessive allele is expressed in
- heterozygous condition only
- homozygous condition only
- F3 generation
- both homozygous and heterozygous conditions.
2 of 25
Q.2 The characters which appear in the first filial generation are called
- recessive characters
- dominant characters
- holandric characters
- lethal characters
3 of 25
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
4 of 25
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%
5 of 25
Q.5 What is the probability of production of dwarf offsprings in a cross betweeen two heterozygous tall pea plants ?
- Zero
- 50%
- 25%
- 100%
6 of 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
7 of 25
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
8 of 25
Q.8 A couple has six daughters. What is the possibility of their having a girl next time ?
- 10%
- 50%
- 90%
- 100%
9 of 25
Q.9 Number of autosomes present in liver cells of a human female is
- 22 autosomes
- 22 pairs
- 23 autosomes
- 23 pairs
10 of 25
Q.10 Haplodiploidy is found in
- grasshoppers and cockroaches
- birds and reptiles
- butterflies and moths
- honeybees, ants and waspe.
11 of 25
Q.11 Rate of mutation is affected by
- temperature
- X rays
- gamma rays
- all of these
12 of 25
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
13 of 25
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
14 of 25
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
15 of 25
Q.15 Mendal formulated the law of purity of gametes on the basis of
- monohybrid cross
- dihybrid cross
- test cross
- back cross
16 of 25
Q.16 The inheritance of flower colour in Antirrhinum (dog flower) is an example of
- incomplete dominance
- co-dominance
- multiple alleles
- linkage
17 of 25
Q.17 Phenotypic and genotypic ratio is similar in case of
- complete dominance
- incomplete dominance
- over dominance
- epistasis
18 of 25
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
19 of 25
Q.19 Inheritance of roan coat in cattle is an example of
- incomplete dominance
- codominance
- multiple allelism
- none of these
20 of 25
Q.20 How many types of gametes can be produced by a diploid organism who is heterozygous for 4 loci ?
- 4
- 8
- 16
- 32
21 of 25
Q.21 Law of independent assortment can be explained with the help of
- dihybrid
- test cross
- back cross
- monohybrid cross
22 of 25
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
23 of 25
Q.23 Chromosomal theory of inheritance was given by
- Morgan et al
- Sutton and Boveri
- Hugo deVries
- Gregor J. Mendel
24 of 25
Q.24 Experimental verification of ‘chromosomal theory of inheritance’ was done by
- Sutton and Boveri
- Morgan et al
- Henking
- Karl Correns
25 of 25
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
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