NATIONAL OPEN UNIVERSITY OF NIGERIA

UNIVERSITY VILLAGE, PLOT 91, CASDASTRAL ZONE, NNAMDI AZIKIWE EXPRESS WAY, JABI, ABUJA.
FACULTY OF SCIENCES
APRIL/MAY 2019 EXAMINATION

COURSE CODE: BIO307

COURSE TITLE: EVOLUTION

CREDIT: 2 Units

TIME ALLOWED: 2 Hours

INTRUCTION: Answer Question ONE (1) and any other THREE (3) Questions

1a. Define Biological Evolution. (2 marks)

  b. Enumerate the causes of spontaneous mutation. (6 marks)

3. Write short notes on the following:  

i. deleterious alleles (4 marks)    

       ii. fate of mutant alleles (4 marks) 

   d. Enumerate the techniques that can be used to investigate polymorphism. (9 marks)

2a. Write short notes on the following:

       i. Hybrid gender (4 marks)  

      ii. Genetic structure (4 marks)

 b. Ecology and Evolution are considered sister disciplines of life science. Discuss. (7marks)

3a. Define adaptation. (3 marks)

  b. Outline five major reasons for extinction. (5 marks)

  c. Distinguish between the Prokaryotes and Eukaryotes (7 marks).

4a. Define genetic recombination. (3 marks)

  b. What do you understand by population genetics?  (3 marks)

  c. Explain the importance of linkage in population genetics. (3 marks)

4. Briefly describe the mechanisms for balancing selection. (6 marks).

5a. Define an Ecosystem. (3 marks)

  b. Classify mutations by:

      i. Inheritance (4 marks)

     ii. Aspect of phenotype affected. (4 marks)

  c. Outline the fate of mutant alleles. (4 marks)