Principles Of Inheritance And Variation MCQs
Question 1. Epistasis was discovered by :
- Johanssen
- Shull
- Bateson
- Mendel.
Answer: 3. Bateson
Question 2. In an experiment on pea plants, plants with round yellow seeds were crossed with wrinkled green seeds. What will be the phenotypic ratio of F2 progeny?
- All round yellow
- 9 round yellow, 3 round green, 3 wrinkled yellow, 1 wrinkled green
- 1 round yellow, 1 round green. 1 wrinkled yellow, 1 wrinkled green
- All wrinkled green.
Answer: 2. 9 round yellow, 3 round green, 3 wrinkled yellow, 1 wrinkled green
Question 3. Some people experience PTC paper on the tongue as bitter; others as tasteless. This character is hereditary. Suppose T stands for dominant gene and t stands for recessive gene, the genetic makeup of a person who cannot taste is:
- TT
- Tt
- tt
- None of these.
Answer: 3. tt
Question 4. Monogenetic traits give rise to :
- Independent assortment of characters
- Colourblindness in man
- Mendelian segregation
- Incomplete dominance.
Answer: 3. Mendelian segregation
Question 5. From a cross AABB x aaBB, the following genotypic ratio will be obtained in F1 generation:
- 1 Aa BB : 3 aa BB
- 3 Aa BB: 1 aa BB
- All AABB: No aa BB
- All AaBB.
Answer: 4. All AaBB.
Question 6. Due to incomplete dominance, a cross between blue and white Andalusian Fowls results in:
- 50% blue and 50% black fowls
- 25% black and 75% white fowls
- 50% blue and 50% white fowls
- 25% blue and 75% white fowls.
Answer: 3. 50% blue and 50% white fowls
Question 7. A dwarf pea plant was treated with gibberellic acid. It grew as tall as the pure tall pea plant. If this treated plant is crossed with a pure tall plant then the phenotypic ratio of F. is likely to be :
- All tall
- 50% tall: 50% dwarf
- 75% tall: 25% dwarf
- All dwarf.
Answer: 1. All tall
Question 8. A cross is made between the two organisms both of which have a genetic make-up of Bb for a particular trait, and two offspring are produced. The first offspring exhibit the dominant trait. What is the probability that the second offspring will exhibit the recessive trait?
- 1/4
- 100
- 3/4
- zero.
Answer: 1. 1/4
Question 9. Why did the lost cross progeny or yellow vs. black mice give 25% more offspring than those resulting from yellow vs. yellow mice
- Due to lethal factors
- Due to cumulative factors
- Due to pseudoallelism
- Due to incomplete dominance.
Answer: 1. Due to lethal factors
Question 10. Mendelian recombination is due to :
- Linkage
- Mollifications
- Independent assortment of genes
- Mutation.
Answer: 3. Independent assortment of genes
Question 11. The genes controlling seven traits in pea studied by Mendel were later found to lie located on the following number of chromosomes
- 4
- 7
- 5
- 6.
Answer: 2. 7
Question 12. Some people experience PTC paper on the tongue as bitter, and others as tasteless. This character is hereditary. Suppose T stands for dominant gene and l stands for recessive gene. Tyre genetic make-up of a person who cannot taste is:
- TT
- Tt
- tt
- None of the above.
Answer: 3. tt
Question 13. One of Mendel’s pure strains of pea plants had green peas. How many different kinds of eggs could such a plant produce about pea colour?
- 1
- 2
- 4
- 8.
Answer: 1. 1
Question 14. If the frequency of a recessive phenotype in a stable population is 25% the frequency of the dominant allele in that population :
- 10%
- 40%
- 50%
- 80%.
Answer: 3. 50%
Question 15. Coat colour in rabbits is an example of:
- Multiple allele
- Epistatic gene
- Lethal factor,
- Pseudoalleles.
Answer: 1. Multiple alleles
Question 16. Height in man is influenced by the interaction of:
- 10 or more pairs of genes
- 20 or more pairs of genes
- Less than 5 pairs of genes
- More than 15 pairs of genes.
Answer: 3. Less than 5 pairs of genes
Question 17. Tallness (T) is dominant and dwarfness (t) is a recessive character. After crossing several Tt plants, a crop of 100 plants is obtained. Out of these 77 are tall and 23 are dwarf. What is the approximate number of hybrids?
- 100
- 54
- 77
- 23.
Answer: 2. 54
Question 18. In a gamete the gene of a special fruit is represented by :
- Tt
- TT
- tT
- tt.
Answer: 3. tT
Question 19. Which of the following forms represents a pair of contrasting character?
- Allele
- Phenotype
- Homozygous
- Heterozygous.
Answer: 4. Heterozygous.
Question 20. The alleles for coloured seed coal are dominant over limit of while seed coat when flowers of a plant with while seed coat (ss) are pollinated with coloured seed coat (Ss), the of colour of seed coat in developing seed would be :
- White
- Coloured
- White and coloured in 1 :1 ratio
- Mosaic.
Answer: 3. white and coloured in 1 :1 ratio
Question 21.When an albino plant is crossed with a normal green plant, all plants in the progeny arc albino because:
- Plastids are inherited through maternal parents
- Albinism is dominant over green character
- Crossing results in structural change in green plastids
- Green plants of male parents become mutants.
Answer: 1. Plastids are inherited through maternal parents
Question 22. Which one of the following is a test cross?
- TT x It
- Tt x Tt
- TT x TT
- Tt x tt.
Answer: 4. Tt x tt.
Question 23. The gene for the red colour is completely dominant. A plant with genotype Rr is selfed, then the genotype of offspring would be :
- 3:1
- 9: 3:3:1
- 1:2:1
- None of the above.
Answer: 3. 1:2:1
Question 24. An organism with two copies of the same allele is:
- Homozygous for that trait
- Homologous for the allele
- Heterozygous for the trait
- Heterozygous for the allele.
Answer: 1. Homozygous for that trait
Question 25. How many different kinds of gametes can an organism of genotype Xx, Yy, and Zz produce?
- 2
- 4
- 8
- 16.
Answer: 3. 8
Question 26. A man receives his X chromosomes from :
- His mother only
- His father only
- Both his mother and father
- Either his mother or his father.
Answer: 1. His mother only
Question 27. In Mendel’s dihybrid crosses, two pairs of factors (T/t) and (R/r) are located in the:
- A pair of non-homologous chromosome
- Pair of homologous chromosome
- The two sex chromosomes
- Two pairs of homologous chromosomes.
Answer: 4. Two pairs of homologous chromosomes.
Question 28. When two genetic loci produce identical phenotypes in cis as well as trans position, they are considered to be :
- Pseudoalleles
- The parts of the same gene
- Multiple alleles
- Different genes.
Answer: 1. Pseudoalleles
Question 29. The phenomenon in which an allele of one gene suppresses the activity of an allele of another gene is known as :
- Dominance
- Inactivation
- Epistasis
- Suppression.
Answer: 3. Epistasis
Question 30. Gamete contains which of the following :
- Both alleles of a gene
- Only one allele of a gene
- All alleles of a gene
- None of the above.
Answer: 2. Only one allele of a gene
Question 31. In the F2 generation, the no of yellow feed ami given soeiK counted by Mendel were:
- 300:10
- 30:10
- 6002:2001
- 3:1.
Answer: 3. 6002:2001
Question 32, A black dog heterozygous for coat colour is crossed with a white bitch recessive homozygous. Progeny will show black-to-white offspring in the ratio of:
- 3 :1
- 1:1
- All black
- All white.
Answer: 2. 1:1
Question 33. Sickle cell anaemia is an example of:
- Genie trait
- Multiple alleles
- TO Monohybrid cross
- None.
Answer: 4. None.
Question 34. Which condition of zygote is lethal:
- HbAHbA
- HbAHbA
- HbSHbS
- Hb- Mb.
Answer: 3. HbSHbS
Question 35. The frequency distribution curve of skin colour in men is:
- Parabola
- Bell-shaped
- S-Shaped
- Bar-shaped.
Answer: 2. Bell-shaped
Question 36. Blood group ‘O’ has :
- One glycoprotein on RBC
- Two glycoproteins on RBC
- Both
- None of the above.
Answer: 4. None of the above.
Question 37. According to Mendel, there are :
- 14 traits or varieties in pea
- 7 traits
- 3 traits
- Many.
Answer: 4. Many.
Question 38. The botanical name of Snapdragon is :
- Lathyms odoratus
- Majus
- Antirrhinum
- None of the above.
Answer: 3. Antirrhinum
Question 39. AB blood group is due to :
- Epistasis
- Interaction
- Pedigree
- Codominance.
Answer: 4. Codominance.
Question 40. Assume a cross between red and white flowered plants which produce pink :
- This is an example of dominance
- This is due to co-dominance
- This is due to segregation
- This is due to incomplete dominance.
Answer: 4. This is due to incomplete dominance.
Question 41. Allele is called :
- A pair of chromosome
- A pair of contrasting character
- A pair of sex chromosome
- None of these.
Answer: 2. A pair of contrasting character
Question 42. Autosomes are :
- Sex chromosomes
- Other than sex chromosomes
- X-chromosome
- Y-chromosome.
Answer: 2. Other than sex chromosomes
Question 43.When two tmielnled individuals or lines me Crossed, the performance of F. hybrid is superior to both its patents. This phenomenon is called:
- Heterosis
- Transformation
- Splicing
- Metamorphosis.
Answer: 1. Heterosis
Question 44. A heterozygous individual carrying a recessive sex-linked gene is called :
- Carrier
- Crossing-over
- Transmitter
- Albino.
Answer: 1. Carrier
Question 45. Pioneer of modern genetics is:
- Mendel
- Morgan
- De-Vries
- Punnet.
Answer: 1. Mendel
Question 46. Mendel selected pea plant for his experiments because it has :
- Short life cycle
- A large number of offspring
- Sexual reproduction
- All of these.
Answer: 2. Large number of offspring
Question 47. The ratio between tall and dwarf plants in F1 generation is
- 9 : 3 : 3: 1
- 3: 1
- 1 : 3 :3: 9
- 7: 1: 1:7.
Answer: 4. 7: 1: 1:7.
Question 48. The process of transmission of characters from one generation to another is called :
- Heredity
- Mutation
- Adaptation
- Aenetics.
Answer: 1. Heredity
Question 49. Which of the following forms represents a pair of contrasting characters?
- Allele
- Phenotype
- Homozygous
- Heterozygous.
Answer: 4. Heterozygous.
Question 50. The appearance of Walnut-Comb in poultry on a cross between pure Pea-Comb and Rose-Comb animals is due to:
- Duplicate genes
- Complementary genes
- Supplementary genes
- Epistasis.
Answer: 3. Supplementary genes
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