NATIONAL OPEN UNIVERSITY OF NIGERIA

UNIVERSITY VILLAGE, PLOT 91, CASDASTRAL ZONE, NNAMDI AZIKIWE EXPRESS WAY, JABI, ABUJA.
FACULTY OF SCIENCES
JANUARY/FEBRUARY 2013 EXAMINATION

COURSE CODE:           BIO 307

COURSE TITLE:            EVOLUTION

TIME ALLOWED:         2 Hours

INSTRUCTION:            ANSWER ANY FOUR QUESTIONS

1ai. Define Biological Evolution?

2. Discuss mechanical isolation and hybrid gender.

bi. Enumerate the causes of spontaneous mutation.

1. 2. Classify mutation on the basis of their functional effects.

 2ai. What do you understand by the term mutation?

ii.  Outline the harmful mutations.

bi. Define adaptation.

2. Write short notes on allopatric speciation and peripatric speciation.

3ai. Give the major reasons for extinction.

2. Write short notes on genetic structure and horizontal gene transfer.

bi. Define population genetics.

2. Discuss the importance of linkage in population genetics.

 4ai. Define the term Ecosystem.

2. Ecology and Evolution are considered sister disciplines of the life science. Discuss.

b List  the  various  techniques’  that  can  be  used  to  investigate  polymorphism  in  the laboratories.

2. Discuss the mechanisms for balancing selection.

5ai.What is genetic recombination?

   ii. Write short notes on the following:

1. the fate of mutant alleles
2. delaterious alleles

bi List five probable stages involved in the origin of life.

ii. Explain the following evidences of evolution:

1. Bio-geographical
2. Bio-chemical
3. Anatomical

6ai. Define classification

    ii Distinguish between prokaryotes and Eukaryotes

   b  List the key evolutionary innovations that can be used to trace the evolution of the plant kingdom.

  ii   How have seeds improved the adaptations of plants to living on land?