NATIONAL OPEN UNIVERSITY OF NIGERIA

UNIVERSITY VILLAGE, PLOT 91, CASDASTRAL ZONE, NNAMDI AZIKIWE EXPRESS WAY, JABI, ABUJA.
FACULTY OF SCIENCES
MARCH/APRIL 2015 EXAMINATION

COURSE CODE:                               BIO 309

COURSE TITLE:                               PLANT BREEDING

TIME ALLOWED:                            2 HOURS

INSTRUCTION: ANSWER QUESTION 1(COMPULSORY) AND ANY OTHER THREE QUESTIONS

1. a. Define Plant Breeding (2marks).

b. Outline five importance of plant breeding (10marks).

c. By definition, differentiate between a Cultigen and a Landrace (4marks).

d. Explain what you understand by Convectional Plant Breeding (9marks).

2. a. Itemise the six steps or major activities of plant breedin g (6marks).

b. Based on cytological principles of plant breeding, describe a chromosome under the following:

i. Chromosome number (5marks)

ii. Chromosome size (5marks)

iii. Chromosome morphology (5marks)

c. In a tabular form, state four differences between a heterochromatin and euchromatin (4marks)

3. a. Explain the term: Heterosis (5marks).

b. By definition, differentiate between heterosis and Inbreeding (4marks).

c. State five adverse effects of inbreeding (5marks).

d. Write short notes on (11marks):

i. Inbreeding depression

ii. Coefficient of Inbreeding

4. Write short notes on the following:

1. Self Incompatibility in plants (5marks);
2. Gametophytic Self Incompatibility (5marks);
3. Sporophytic Self Incompatibility (5marks).;