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Chapter: 12th Botany : Chapter 3 : Chromosomal Basis of Inheritance

Choose the Correct Answers (Pure Science Group)

Botany : Chromosomal Basis of Inheritance : Pure Science Group Book Back and Important Questions Answers - Multiple Choose the Correct Answers

Botany : Chromosomal Basis of Inheritance

Choose the Correct Answers (Pure Science Group)

Evaluation

 

1. An allohexaploidy contains

a) Six different genomes

b) Six copies of three different genomes

c) Two copies of three different genomes

d) Six copies of one genome

 

2. 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

 

3. Match list I with list II


a) A-i, B-iii, C-ii, D-iv

b) A-ii, B-iii, C-iv, D-i

c) A-ii, B-iii, C-i, D-iv

d) A-iii, B-ii, C-i, D-iv

 

4. Which of the following sentences are correct?

1. The offspring exhibit only parental combinations due to incomplete linkage

2. The linked genes exhibit some crossing over in complete linkage

3. The separation of two linked genes are possible in incomplete linkage

4. Crossing over is absent in complete linkage

a) 1 and 2

b) 2 and 3

c) 3 and 4

d) 1 and 4

 

5. Accurate mapping of genes can be done by three point test cross because increases

a) Possibility of single cross over

b) Possibility of double cross over

c) Possibility of multiple cross over

d) Possibility of recombination frequency

 

6. 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

 

7. Genes G S L H are located on same chromosome. The recombination percentage is between L and G is 15%, S and L is 50%, H and S are 20%. The correct order of genes is

a) GHSL

b) SHGL

c) SGHL

d) HSLG

 

8. The point mutation sequence for transition, transition, transversion and transversion in DNA are

a) A to T, T to A, C to G and G to C

b) A to G, C to T, C to G and T to A

c) C to G, A to G, T to A and G to A

d) G to C, A to T, T to A and C to G

 

9. If haploid number in a cell is 18. The double monosomic and trisomic number will be

a) 35 and 37

b) 34 and 35

c) 37 and 35

d) 17 and 19

 

10. Changing the codon AGC to AGA represents

a) missense mutation

b) nonsense mutation

c) frameshift mutation

d) deletion mutation

 

11. Assertion (A): Gamma rays are generally use to induce mutation in wheat varieties.

Reason (R): Because they carry lower energy to non-ionize electrons from atom

a) A is correct. R is correct explanation of A

b) A is correct. R is not correct explanation of A

c) A is correct. R is wrong explanation of A

d) A and R is wrong

 

12. How many map units separate two alleles A and B if the recombination frequency is 0.09?

a) 900 cM

b) 90 cM

c) 9 cM

d) 0.9 cM

 

13. Which one of the following pairs of codons is correctly matched with their function or the signal for the particular amino acid?

a) UUA, UCA - Leucine

b) GUU, GCU - Alanine

c) UAG, UGA - Stop

d) AUG, ACG – Start / Methionine

 

14. Removal of introns and joining of exons in a defined order during transcription is called

a) Splicing

b) Looping

c) Inducing

d) Slicing

 

15. If one strand of DNA has the nitrogenous base sequence as ATCTS, what would be the complementary RNA strand sequence?

a) ATCGU

b) TTAGU

c) UAGAC

d) AACTG

 

16. Removal of RNA polymerase III nucleoplasm will affect the synthesis of

a) rRNA

b) tRNA

c) hnRNA

d) mRNA

 

17. DNA dependent RNA polymerase catalyzes transcription on one strand of the DNA

which is called the

a) Alpha strand

b) Anti strand

c) Template strand

d) Coding strand

 

18. Which of the following correctly represents the flow of genetic information?

a) DNA → RNA → Protein

b) RNA → DNA → Protein

c) RNA → Protein → DNA

d) Protein → RNA → DNA

 

19. Initiation codon is

a) UUU

b) UGA

c) AUG

d) UAG

 

20. A eukaryotic gene contains two kinds of base sequences which of these plays an important role in protein synthesis?

a) Introns

b) Exons

c) Both a and b

d) None of the above

 

21. Codon – anticodon interactions occur by

a) Covalent bond

b) Electrostatic interactions

c) Hydrogen bonds

d) Hydrophobic interaction

 

22. Which of the following RNA polymerases is responsible for the transcription of protein coding genes in eukaryotes?

a) RNA Pol I

b) RNA Poly II

c) RNA Pol III

d) RNA Pol IV

 

23. How are RNA molecules transported out of the nucleus

a) Passive diffusion through the membrane

b) Through membrane pores in an energy independent process

c) Through membrane pores in an energy dependent process

d) Through a channel in the membrane that leads to the endoplastic reticulation

 

24. During translation the codon in mRNA is actually “read” by

a) The A site in the ribosomes

b) The P site in the ribosomes

c) The anticodon in at RNA

d) The anticodon is an amino acid

 

25. A complex of ribosome attached to a single strand of RNA is known as

a) Polysome

b) Polymer

c) Polypeptide

d) Okazaki fragment

 

26. Which of the following is the start codon

a) AUG

b) UGA

d) UAA

d) UAG

 

27. What is true about tRNA?

a) It binds with an amino acid at its 3’ end

b) It has 5 double stranded regions

c) It has a codon at one end which recognizes the anticodon of mRNA

d) It looks like clover leaf in the three D structure

 

28. Which one of the following hydrolysis internal phosphodiester bonds in a

polynucleotide chain?

a) Lipase

b) Exonuclease

c) Endonuclease

d) Protease

 

29. DNA element with ability to change position is called

a) Cistron

b) Transposon

c) Intron

d) Recon

 

30. Spliceosomes are not found in cells of

a) Plants

b) Fungi

c) Animals

d) Bacteria

 

31. During DNA replication Okazaki fragments are used to elongate

a) The leading strand towards replication fork

b) The lagging strand towards replication fork

c) The leading strand away from replication fork

d) The lagging strand away from replication fork

 

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