Chromosomal Basis of Inheritance Model Question Paper

12th Standard EM

    Reg.No. :
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Biology

Time : 01:00:00 Hrs
Total Marks : 50
    10 x 1 = 10
  1. The A and B genes are 10 cM apart on a chromosome. If an AB/ab heterozygote is testcrossed to ab/ab, how many of each progeny class would you expect out of 100 total progeny?

    (a)

    25 AB, 25 ab, 25 Ab, 25 aB

    (b)

    10 AB, 10 ab

    (c)

    45 AB, 45 ab

    (d)

    45 AB, 45 ab, 5 Ab, 5aB

  2. Due to incomplete linkage in maize, the ratio of parental and recombinants are

    (a)

    50:50

    (b)

    7:1:1:7

    (c)

    96.4: 3.6

    (d)

    1:7:7:1

  3. Changing the codon AGC to AGA represents

    (a)

    mis-sense mutation

    (b)

    non-sense mutation

    (c)

    frameshift mutation

    (d)

    deletion mutation

  4. The following sequence represents the location of genes in a chromosome. A - B - C - M - R - S - y -Z. Which of the gene pairs will have least chance of getting inherited together?

    (a)

    A and M

    (b)

    Sand Y

    (c)

    M and Z

    (d)

    A and Y

  5. Identify the syntenic gene from the given genes sequence of a chromosome G-H-I-J-K-L-M-A-B

    (a)

    G and H

    (b)

    J, K and L

    (c)

    G andB

    (d)

    AandB

  6. In a population of 250 progenies produced, only 120 resemble the parental forms. Calculate the recombinant frequency.

    (a)

    66%

    (b)

    52%

    (c)

    59%

    (d)

    49%

  7. Which one of the following ploidy is irrelevant to others?

    (a)

    Monosomy

    (b)

    Trisomy

    (c)

    Tetrasomy

    (d)

    Pentasomy

  8. Statement 1: Self-sterility in Nicotiana is controlled by multiple alleles.
    Statement 2: Multiple alleles are always responsible for the same character.

    (a)

    Statement 1 is correct and Statement 2 is incorrect

    (b)

    Statement 1 is incorrect and Statement 2 is correct

    (c)

    Both the statements are correct

    (d)

    Both the statements are incorrect

  9. Assertion (A): Self-sterility is observed in Nicotiana species.
    Reason (R): Because the genes are located on chromosome.

    (a)

    A is true R is false

    (b)

    Both A and R are false

    (c)

    A is true, R is not correct explanation for A

    (d)

    R explains A

  10. Observe the gene sequence and identify the types of aberration ABC BCD E F?

    (a)

    Tandem duplication

    (b)

    Simple duplication

    (c)

    Reverse tandem duplication

    (d)

    Displaced tandem duplication

  11. 5 x 2 = 10
  12. If you cross dominant genotype PV/PV male Drosophila with double recessive female and obtain F1 hybrid. Now you cross F1 male with double recessive female.
    i) What type of linkage is seen?
    ii) Draw the cross with correct genotype.
    iii) What is the possible genotype in F2 generation?

  13. What is the difference between missense and nonsense mutation?

  14. What does the condition synteny refers to?

  15. Who coined the term crossing over? When does the crossing over occurs in a cell?

  16. Mention the major stages involved in crossing over.

  17. 5 x 3 = 15
  18. Write the salient features of Sutton and Boveri concept.

  19. Point out any three salient features of chromosomal theory of inheritance.

  20. Compare Mendelian factors with chromosome.

  21. State Coupling and Repulsion theory.

  22. Give a short note on incomplete linkage.

  23. 3 x 5 = 15
  24. Mention the name of man-made cereal. How it is formed?

  25. Why crossing over is important?

  26. Explain the Translocation type of chromosomal aberration.

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