NATIONAL OPEN UNIVERSITY OF NIGERIA

UNIVERSITY VILLAGE, PLOT 91, CASDASTRAL ZONE, NNAMDI AZIKIWE EXPRESS WAY, JABI, ABUJA.
FACULTY OF SCIENCES
JANUARY/FEBRUARY 2018 EXAMINATION

COURSE CODE: BIO 402   CREDIT UNITS: 2

COURSE TITLE: PHYTOGENETICS OF PLANTS

TIME ALLOWED: 2 Hours

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

1a. Define cytogenetics (6marks)

b. What do you understand by monospermy? (2marks)

c. Explain chromosomes morphology (5marks)

d. Name the three shapes found in chromosomes (6marks)

e. What is diploidy? (3marks)

f. What are telomeres and  their cytogenetic importance?(3marks)

2a. Discuss the roles of Edward Strasberger in the development of Cytogenetics? (9marks)

b. Distinguish between heterochromatin and euchromatin (4marks)

c. What is the main idea of the chromosome theory of inheritance? (2marks)

3a. Discuss the origin of variations in chromosome number (10marks)

b. Why are diploids usually fertile without experiencing the problems of fertility associated with other state of euploidy? (5marks)

4a. What is polyploidy? (5marks)

b. Discuss the advantages of polyploidy (10marks)

5. Write notes on the following:

a. Trisomics (2n+1) (5marks)

b. Chromosome Deletion (10marks)