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: BIO 402 Cytogenetic Genetics of plants   

Units: 2

Time allowed: 2 Hours

INSTRUCTION: Answer question ONE (1) and any other THREE (3) questions

1a. What do you understand by chromosome compensation? (2marks)

b. What are the main diagnostic features of inversions? (4marks)

c. Write short note on the concept of basic chromosome number (6marks)

d. Name six plants in which spontaneous monoploid have been found (6marks)

e. Explain the concept of genetic balance and development (7marks)

2a. In order to have a normal meiosis, there must be two homologous chromosomes present. In view of this, discuss meiotic behaviour in monoploids. (10marks)

b. Discuss the role of Walter Fleming in cytogenetic (5marks)

3. Discuss the experiment of Theodore Boveri on double fertilization. (15marks)

4a. Explain the fourth level chromosome packaging (7marks)

b.Thomas Morgan was a contributor to the chromosome theory of inheritance. Discuss his contribution (3marks)

c. Write briefly on dicentric chromosomes (5marks)

5a. Write note on satellite chromosomes (9marks)

b. Write briefly on the contribution of Wilhelm August Oscar Hertwig in the development of cytogenetic (3marks)

c. Explain briefly how DNA is organised to form chromatin (3marks)