Q2. The characters which appear in the first filial generation are called
A) recessive characters
B) dominant characters
C) holandric characters
D) lethal characters
Answer: (B) dominant characters
These characters are called dominant characters
Q3. 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 ?
A) 3:01
B) 1:02:01
C) 1:01
D) None of the above
Answer: (C) 1:01
Q4. In a monohybrid cross between two heterozygous individuals, percentage of pure homozygous individuals obtained in F1 generation will be
A) 25%
B) 50%
C) 75%
D) 100%
Answer: (B) 50%
Q5. What is the probability of production of dwarf offsprings in a cross betweeen two heterozygous tall pea plants ?
A) Zero
B) 50%
C) 25%
D) 100%
Answer: (C) 25%
The probability of production of dwarf offsprings in a cross betweeen two heterozygous tall pea plants is 25%
Q6. Which of the following crosses will give tall and dwarf pea plants in same proportions ?
A) TT × tt
B) Tt × tt
C) TT × Tt
D) tt × tt
Answer: (B) Tt × tt
Tt × tt will give tall and dwarf pea plants in same proportions
Q7. Which of the following is incorrect regarding ZW – ZZ type of sex determination ?
A) It occurs in birds and some reptiles.
B) Females are homogametic and males are heterogametic.
C) 1:1 sex ratio is produced in the offsprings
D) All of these
Answer: (B) Females are homogametic and males are heterogametic.
Females are homogametic and males are heterogametic is incorrect.
Q8. A couple has six daughters. What is the possibility of their having a girl next time ?
A) 10%
B) 50%
C) 90%
D) 100%
Answer: (B) 50%
Probability is 50 %.
Q9. Number of autosomes present in liver cells of a human female is
A) 22 autosomes
B) 22 pairs
C) 23 autosomes
D) 23 pairs
Answer: (B) 22 pairs
autosomes present in liver cells of a human female is 22 pairs
Q10. Haplodiploidy is found in
A) grasshoppers and cockroaches
B) birds and reptiles
C) butterflies and moths
D) honeybees, ants and waspe.
Answer: (D) honeybees, ants and waspe.
Haplodiploidy is found in honeybees, ants and waspe.
Q11. Rate of mutation is affected by
A) temperature
B) X rays
C) gamma rays
D) all of these
Answer: (D) all of these
all of these
Q12. Two or more independent genes present on different chromosomes which determine nearly same phenotype are called
A) supplementary genes
B) complementary genes
C) duplicate genes
D) none of these
Answer: (C) duplicate genes
It is known as duplicate genes
Q13. Select the incorrect statement regarding pedigree analysis
A) Solid symbols show unaffected individuals
B) Proband is the person from which case history starts
C) It is useful for genetic counsellors
D) It is an analysis of traits in several generations of a family
Answer: (A) Solid symbols show unaffected individuals
Solid symbols show affected individuals
Q14. To determine the genotype of a tall plant of F2 generation, Mendel crossed this plant with a dwarf plant. This cross represents a
A) test cross
B) back cross
C) reciprocal cross
D) dihybrid cross
Answer: (A) test cross
This cross represents a test cross.
Q15. Mendal formulated the law of purity of gametes on the basis of
A) monohybrid cross
B) dihybrid cross
C) test cross
D) back cross
Answer: (A) monohybrid cross
law of purity of gametes was based on monohybrid cross
Q16. The inheritance of flower colour in Antirrhinum (dog flower) is an example of
A) incomplete dominance
B) co-dominance
C) multiple alleles
D) linkage
Answer: (A) incomplete dominance
Flower colour in Antirrhinum (dog flower) is an example of incomplete dominance
Q17. Phenotypic and genotypic ratio is similar in case of
A) complete dominance
B) incomplete dominance
C) over dominance
D) epistasis
Answer: (B) incomplete dominance
Q18. What can be the blood group of offspring when both parents have AB blood group ?
A) AB only
B) A, B and AB
C) A, B, AB and O
D) A and B only
Answer: (B) A, B and AB
Q19. Inheritance of roan coat in cattle is an example of
A) incomplete dominance
B) codominance
C) multiple allelism
D) none of these
Answer: (B) codominance
Q20. How many types of gametes can be produced by a diploid organism who is heterozygous for 4 loci ?
A) 4
B) 8
C) 16
D) 32
Answer: (C) 16
It can produce 16 gametes.
Q21. Law of independent assortment can be explained with the help of
A) dihybrid
B) test cross
C) back cross
D) monohybrid cross
Answer: (A) dihybrid
It can be explained by dihybrid cross
Q22. Which three scientists independently rediscovered Mendel’s work ?
A) Avery, McLeod, McCarty
B) Sutton, Morgan and Bridges
C) Bateson, Punnet and Bridges
D) de Vries, Correns and Tschemark
Answer: (D) de Vries, Correns and Tschemark
Three scientists were de Vries, Correns and Tschemark.
Q23. Chromosomal theory of inheritance was given by
A) Morgan et al
B) Sutton and Boveri
C) Hugo deVries
D) Gregor J. Mendel
Answer: (B) Sutton and Boveri
This theory was given by Sutton and Boveri.
Q24. Experimental verification of ‘chromosomal theory of inheritance’ was done by
A) Sutton and Boveri
B) Morgan et al
C) Henking
D) Karl Correns
Answer: (B) Morgan et al
Q25. Genes located very close to one another on same chromosome tend to be transmitted together and are called as
A) allelomorphs
B) identical genes
C) linked genes
D) recessive genes
Answer: (C) linked genes
It is called as linked genes.
🎥 Video Resources
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