41. The exchange of genes between homologous chromosomes is called
- A. crossing over
- B. back cross
- C. test cross
- D. mutation
42. 
The diagrams above are illustrations of the inheritance of coat colour in mice. J, K, L, M and N are parents. The cross between two parent mice gave rise to offspring P, Q, R and S. Which of the offspring are all homozygous?
- A. P
- B. Q
- C. S
- D. R
43. Genes that remain linked are those
- A. close to each other on the chromosomes
- B. on the same locus on the chromosomes
- C. on the homologous chromosomes
- D. which are allelic pair
44. plant cell has 14 chromosomes prior to mitosis. What is the number of chromosomes in the daughter cells?
- A. 14
- B. 56
- C. 28
- D. 7
45. The chemical bond that holds the bases of the two strands of DNA together is
- A. oxygen bond
- B. hydrogen bond
- C. electrovalent bond
- D. covalent bond
46. 
The diagram above is an illustration of one of the theories of evolution. Who proposed the theory in the illustration?
- A. Louis Pasteur
- B. Gregor Mendel
- C. Robert Hooke
- D. Jean Lamarck
47.
The theory supports
- A. natural selection
- B. struggle for survival
- C. independent assortment
- D. the use and disuse of body parts
48. In evolution, fossils are naturally preserved in
- A. rocks
- B. water
- C. chemicals
- D. trees
49. In evolution, fossils are naturally preserved in
- A. rocks
- B. water
- C. chemicals
- D. trees
50. Which of the following is not a social insect?
- A. termite
- B. housefly
- C. honeybee
- D. ant
