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LTL C12 BIO Test Series
LTL C12 Bio TEST 1 PRINCIPLES OF INHERITANCE AND VARIATION
Greetings from LEARN TO LEAD ACADEMY!!!
The number of attempts remaining is 2
Greetings from LEARN TO LEAD ACADEMY !!! All the best !!!
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1. ____________ pairs of contrasting traits were studied by Mendel in pea plant.
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2. Some of the dominant traits studied by Mendel were
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3. __________ code for a pair of contrasting traits of same gene.
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4. In a monohybrid cross between two heterozygous individuals, percentage of pure homozygous individuals obtained in F1 generation will be
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5. Read the given statements and select the correct option.
Statement 1: Test cross is used to determine an unknown genotype within one breeding generation.
Statement 2: Test cross is a cross between F1 hybrid and dominant parent.
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6. Mendel formulated the law of purity of gametes on the basis of
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7. Read the given statements and select the correct option.
Statement 1: The law of segregation is one of the most important contributions to the biology.
Statement 2: Law of segregation introduced the concept of heredity factors as discrete physical entities which do not become blended.
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8. The inheritance of flower colour in Antirrhinum (dog flower) is an example of
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9. Phenotypic and genotypic ratio is similar in case of
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10. A child has blood group 'O'. If father has blood group 'A' and mother has blood group 'B', work out the genotypes of the parents.
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11. ABO blood grouping in human beings cites the example of
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12. Match column I with column II and select the correct option from the given codes.
Column I Column II
A. Dihybrid test cross (i) 9:3:3:1
B. Law of segregation (ii) Dihybrid cross
C. Law of independent assortment (iii) 1:1:1:1
D. ABO blood group in man (iv) Purity of gametes
(v) Multiple allelism
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13. "When two pairs of traits are combined in a hybrid, segregation of one pair of characters is independent of the other pair of characters". The statement explains which of the following laws/principles of Mendel?
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14. Chromosomal theory of inheritance was given by
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15. Experimental verification of 'chromosomal theory of inheritance' was done by
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16. Match column I with column II and select the correct option from the given codes.
A. Multiple allelism (ⅰ) Tt x tt
B. Back cross (ii) Tt x TT
C. Test cross (iii) Human blood groups
D. Crossing over (iv) Non-parental gene combination
E. Recombination (v) Non-sister chromatids
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17. Which of the following are reasons for Mendel's success?
(i) Usage of purelines or pure breeding varieties
(ii) Consideration of one character at a time
(iii) Maintenance of statistical records of experiments
(iv) Knowledge of linkage and incomplete dominance
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18. The gene disorder phenylketonuria is an example for
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19. Match column I with column II and select the correct option from the given codes.
A. Gregor J. Mendel (i) Chromosomal theory of inheritance
b. Sutton and Boveri (ii) Laws of inheritance
C. Henking (iii) Drosophila
D. Morgan (iv) Discovered X-body
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20. Select the correct statements regarding honeybees.
(i) The queen bee and the worker bees develop from fertilised eggs and are sexually females.
(ii) Males (drones) develop parthenogenetically from unfertilised eggs.
(iii) Queen bee feeds upon royal jelly and the worker bees feed upon bee bread.
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21. Match column I with column II and select the correct option from the given codes.
A. Chromosomal aberration (i) An additional sex chromosome
B. Down's syndrome (ii) Inversion
C. Klinefelter's syndrome (iii) Presence of an extra chromosome
D. Turner's syndrome (iv) Absence of sex chromosome
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22. Find out the mismatched pair.
(a) Haemophilia - Sex linked recessive
(b) Cystic fibrosis - Autosomal recessive
(c) Down's syndrome - Trisomy 21
(d) Turner's syndrome - Y-linked
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23. Point mutation may occur due to
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24. Which one is the incorrect match ?
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25. Study the pedigree chart of a family showing the inheritance of sickle-cell anaemia.
The trait traced in the above pedigree chart is
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26. __________ is an example of X-linked recessive trait.
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27. The disease sickle-cell anaemia is caused by the substitution of _(i)__by __(ii)___ at the ___(iii)___ position of ___(iv)___ globin chain of haemoglobin molecule.
Which of the following correctly fills the blanks in the above statement?
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28. An individual affected by phenylketonuria lacks an enzyme that converts the amino acid _______ into ___________
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29. Read the given statements.
(i) Incomplete or mosaic inheritance is an example of pre-Mendelian concept of blending inheritance.
(ii) Test cross is a special type of back cross.
(iii) Chromosomal aberrations are commonly observed in cancer cells.
(iv) Thalassemia is a Mendelian disorder.
which of the above statements are correct?
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30. Failure of segregation of chromatids during cell division results in the gain or loss of chromosomes, this is called
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31. Match column I with column II and select the correct option from the given codes.
A. Autosomal recessive trait (i) Down's syndrome or mongolism
B. Sex-linked recessive trait (ii) Phenylketonuria
C. Metabolic error linked to
autosomal recessive trait (iii) Haemophilia
D. Additional 21st chromosome (iv) Sickle cell anaemia
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32. Klinefelter's syndrome is characterised by a karyotype of
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33. Which of the following is mismatched pair of disease and its related symptom?
Disease Symptom
(a) Phenylketonuria Urine turns black on exposure to air
(b) Down's syndrome Physical and mental retardation
(c) Klinefelter's syndrome Sterile males
(d) Turner's syndrome Sterile females
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34. ZZ/ZW type of sex determination is seen in
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35. Occasionally, a single gene may express more than one effect. The phenomenon is called
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Q. No 36 to 38 Directions: In the following questions, a statement of assertion is followed by a statement of reason. Mark the correct choice
36. Assertion: Mendel conducted artificial pollination experiments for his genetic studies using true-breeding pea lines.
Reason: A true-breeding line shows the stable trait inheritance and expression for several generations.
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37. Assertion: In honeybees, drones have 16 chromosomes while queen has 32 chromosomes.
Reason: Male bees develop from unfertilised eggs and female bees from fertilised eggs.
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Q. No 36 to 38 Directions: In the following questions, a statement of assertion is followed by a statement of reason. Mark the correct choice:
38. Assertion: ABO blood group system provides a good example of multiple alleles.
Reason: In ABO blood group system, when I^A and I ^B alleles are present together, they both express their own types.
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39. Which one from those given below is the period for Mendel's hybridisation experiments?
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40. In a cross between a male and female, both heterozygous for sickle cell anaemia gene, what percentage of the progeny will be diseased?
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41. In his classic experiments on pea plants, Mendel did not use
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42. Assertion: A geneticist crossed two plants and got 50% tall and 50% dwarf progenies.
Reason: This cross follows Mendelian law as one of the parent plant might be heterozygous.
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44. Select the correct match.
(a) Haemophilia - Y linked
(b) Phenylketonuria - Autosomal dominant trait
(c) Sickle cell anaemia - Autosomal recessive trait, chromosome -11
(d) Thalassemia - X linked
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43. Two plants one with black flower and other with white coloured flower were crossed in an experiment. In the next generation grey coloured flowers were obtained. The reason for the result is
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45. Which idea is depicted by a cross in which the F1 generation resembles both the parents?
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The average score is 44%
