(c) 30. (c) 31. (d) 32. (c) 33. (a)
(c) 35. (d) 36. (a) 37. (c) 38. (b)
(i) It is a dominant allele. Also, one parent (father)
must be homozygous dominant, while the other
parent (mother) must be homozygous recessive.
(ii) Since the shaded symbol appears in all offspring
irrespective of sex, it refers to an autosomal allele, and
not sex linked.
CHAPTER-6 : MolECulAR BASIS of INHERITANCE
- (c) 2. (b) 3. (c) 4. (d) 5. (a)
- (c) 7. (b) 8. (a) 9. (a) 10. (b)
- (d) 12. (a) 13. (d) 14. (b) 15. (b)
- false. It is the beads-on-string structure in chromatin,
packaged to form chromatin fibres, that are further
coiled and condensed at metaphase stage, to form
chromosomes. - false. The negatively charged DNA is wrapped around
the positively charged histone octamer to form a
nucleosome. - True
- false. It is monocistronic in eukaryotes and
polycistronic in prokaryotes. - True
- false. The transcription and translation can be
coupled in prokaryotes not eukaryotes as the required
machinery for transcription is in nucleus while that for
translation is in cytoplasm. - True
- false. UTRs are present at both 5’ end and 3’ end,
and are required for efficient translation process. - True 25. True
- A-(vii), B-(i), C-(vi), D-(ii), E-(v), F-(iii), G-(iv)
- A-(i, vi), B-(iii, xi), C-(iv, ix), D-(ii, vii), E-(v, xii),
F-(viii, x), G-(xiii, xiv)
28.(A) (i) DNA dependent RNA (ii) Transcription
(iii) Pol III (iv) Pol II (v) Pol I or Pol A
(B) Additional nucleotides are added to ends of RNAs for
specific functions - CCC CCA segment in tRNA, cap
nucleotides at 3 ′ 5 ′ end of mRNA or poly-G poly-A
segments at 5 ′ 3 ′ end of mRNA. The cap is formed
by modification of ATP GTP into 6-methyl adenosine
7-methyl guanosine or 6mA 7mG.- (d) 30. (b) 31. (c) 32. (d) 33. (c)
- (b) 35. (b) 36. (b) 37. (c) 38. (d)
- P-Anticodon loop
Q-T y C loop R-DHU loop
S-Variable arm T-Amino acid attaching site - (a) P; (b) T; (c) Q; (d) R; (e) S
CHAPTER-7 : EvoluTIoN - (c) 2. (c) 3. (c) 4. (c) 5. (a)
- (a) 7. (a) 8. (b) 9. (a) 10. (b)
- (d) 12. (a) 13. (c) 14. (c) 15. (b)
- false. Life appeared 500 milion years after the formation
of earth, 4 billion years back. - false. They represent analogy.
- True
- false. When convergent evolution is between closely
related species, it is parallel evolution. - True 21. True 22. True
- false. No modern ape is director ancestor, but it
is believed that man and modern apes are cousins
descended from common ancestors. - false. It is the probability of allele A with frequency p.
- false. Only blood groups A and B are found in apes
and not AB and O. - A-(vi), B-(iv), C-(v), D-(i), E-(vii), F-(ii), G-(iii)
- A-(i, xi), B-(ii, x), C-(v, viii), D-(vi, vii), E-(iv, xii),
F-(iii, xiii), G-(ix, xiv)
28.(A) (i) Sibling species, (ii) Drosophila pseudoobscura,
(iii) Drosophila persimilis, ( i v ) e n d e m i c s p e c i e s ,
(v) parapatric species.
(B) Nearctic Neotropical realm covers Central and South
America while Neotropical Nearctic realm covers
Canada and United States of America. Ethiopian
Palaearctic realm includes Sahara Desert of Africa and
Siberia while Palaearctic Ethiopian realm, includes
Arabia and Madagascar. Palaearctic and Nearctic
realm together form Wallace’s line Holoarctic region
while Holoarctic region Wallace’s line lies between
Oriental and Australian realm. - (b) 30. (c) 31. (c) 32. (c) 33. (b)
- (b) 35. (a) 36. (c) 37. (b) 38. (c)
- A-Carboniferous; B-Permian; C-Triassic
D-Cretaceous; E-Jurassic; F- Quaternary; G-Tertiary - (a) (i) F; (ii) G; (iii) D; (iv) E; (v) C; (vi) B; (vii) A
(b) (i) F; (ii) E; (iii) G; (iv) A nn