KCET 2025 Practice Test || Biology Practice Test || Biology Questions 11-20

Biology Practice Test || Biology Exam Questions 11-20 || KCET 2025 Biology Part

11. When a single gene exhibits multiple phenotypic expression, the phenomenon is called ____

(1) Incomplete dominance (2) Pleiotropy (3) Co-dominance (4) Polygenic inheritance

12. A colourblind man marries a carrier woman. The percentage of their colourblind progeny in the next generation will be ___

(1) 50% (2) 75% (3) 100% (4) 25%

13. Identify which one of the given pair of options is correct with respect to Down's syndrome and Turner's syndrome.
Option     Down's syndrome symptoms     Turner's syndrome symptoms
(a)       Short-statured individual       Gynaecomastia in man
(b)       Round head, partially open mouth       Overall masculine development
(c)       Broad palm, physical and mental development retarded       Sterile females with rudimentary ovaries
(d)       Additional copy of an X-chromosome       Absence of an X-chromosome

(1) b (2) c (3) d (4) a

14. RNA polymerase II is responsible for the transcription of ___

(1) rRNA (2) hnRNA (3) snRNA (4) tRNA

15. Which of the following enzymes increases the permeability of the bacterial cell to lactose?

(1) Permease (2) Transacetylase (3) Amylase (4) β-galactosidase

16. Which of the following statements are correct with reference to prokaryotic genome?
(a) Monocistronic structural genes
(b) Introns absent in structural genes
(c) Transcription and translation are coupled processes
(d) Primary transcript undergoes splicing
(e) Only one RNA polymerase is present

(1) Only b, c and e are correct (2) Only a, d and e are correct (3) Only a, b and c are correct (4) Only a, b and d are correct

17. When a change in the gene frequency of a population occurs by chance, it is called ___

(1) Gene migration (2) Genetic recombination (3) Genetic drift (4) Founder effect

18. Darwin's finches represent one of the best examples of ____

(1) Adaptive radiation (2) Chemical evolution (3) Genetic equilibrium (4) Seasonal migration

19. Choose the correct statements from the following:
(a) Charles Darwin travelled around the world in a ship called HMS Beagle
(b) There has been gradual evolution of life forms
(c) According to Darwin, fitness refers to physical fitness only –
(d) Fossils are remains of hard parts of life forms found in rocks
(e) Hugo De Vries, a naturalist worked in Malay Archipelago.

(1) a, c and e are correct (2) a, b and d are correct (3) a, c and d are correct (4) a, b and e are correct

20. In which of the following, HIV replicates and produces its progeny viruses?

(1) Memory T-lymphocytes (2) Killer T-lymphocytes (3) Suppressor T-lymphocytes (4) Helper T-lymphocytes

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