UNIVERSITY OF AGRICULTURAL SCIENCES, BANGALORE
Department of Genetics and Plant Breeding
GPB-21 Fundamentals of Plant Breeding (3+2+1)
II B.Sc. (Hons. Agri., C Section “C2” II Semester 2025-26
Practical exam
Name: ___________________
ID. No: __________________
Date: 25-06-2026
Max. marks: 15.00
Max. time: 1 Hour
I.   Fill in the blanks. 0.5 x 5 = 2.5
1.
Flowers having both stamens and pistil are called flowers.
2.
Natural out-crossing in often cross-pollinated crops generally ranges from to %.
3.
Male sterility controlled by interaction of cytoplasmic and nuclear genes is called male sterility.
4.
In maize, the female inflorescence is called .
5.
Formula for percentage homozygosity after m generations of selfing .
II.   State True or false, if false correct them. 0.5 x 5 = 2.5
1.
Cleistogamy promotes self-pollination.
2.
Maize is a dioecious crop.
3.
Self-pollination increases homozygosity in a population.
4.
Percentage of heterozygosity after m generations of selfing (1/2)m x 100.
5.
A three way cross hybrid is produced by crossing two double cross hybrids.
III. Match the following. 0.5 x 5 = 2.5
Sl. No A B
1. Cleistogamy Ring method
2. Entomophily Protogyny
3. Monoecious plant Male and female flowers on the same plant
4. Bajra Transfer of pollen by insects
5. Cotton Self-pollination in unopened flowers
IV. Answer any THREE. 1.5 x 3 = 4.5
1.
List any three tools present in a plant breeder's kit and mention their uses.
2.
Define self-pollination and mention any two mechanisms promoting it.
3.
A breeder observed that a flower remains closed throughout anthesis. What type of pollination is expected in such flowers? Explain.
4.
Differentiate between Genetic Male Sterility (GMS) and Cytoplasmic Genetic Male Sterility (CGMS).
V. Answer any TWO. 1.5 x 2 = 3.0
1.
The Narrow Sense and Broad sense heritability of body weight in mouse is 0.7. The Phenotypic variance (VP) is 0.6. What is the additive genetic variance (VA) body weight in these mice?
2.
Predict the yield of all possible DCH from the SCH,

A x B = 8.8 q/ha,

B x D = 8.0 q/ha,

B x C = 9.2 q/ha,

A x D = 8.4 q/ha,

A x C = 8.9 q/ha,

C x D = 8.1 q/ha.

3.
How many single crosses (with reciprocal & without reciprocal) can be made by using nine inbred lines?