The inbreeding coefficients of progenies produced by selfing, parent–offspring mating, full sibs mating, and half sibs mating during the first generation are respectively:
Options
0.5, 0.25, 0.25, 0.125 ✓
0.5, 0.50, 0.50, 0.125
0.5, 0.50, 0.25, 0.125
0.5, 0.25, 0.50, 0.125
Correct Answer: A
Explanation in English
Correct Answer: 0.5, 0.25, 0.25, 0.125
From Table 3 (Coefficient of Relationship and Inbreeding Coefficient) in the notes:
Mating Type
Coefficient of Relationship (Rxy)
Inbreeding Coefficient (Fx = ½ Rxy)
Selfing
1.0
0.5 (50%)
Parent–offspring / Full-sib
0.50 (50%)
0.25 (25%)
Half-sib / Grandparent–grandoffspring / Double first cousin
0.25 (25%)
0.125 (12.5%)
Single first cousin
0.125 (12.5%)
0.0625 (6.25%)
Half first cousin
0.0625 (6.25%)
0.03125 (3.125%)
Key Rule
Inbreeding coefficient (Fx) = ½ × Coefficient of Relationship (Rxy). Inbreeding is always half the coefficient of relationship.
Inbred Line
A line is called an inbred line if it has a minimum inbreeding coefficient of 0.375 (37.5%) — developed from two generations of full-sib mating.
📚 About this Topic — Animal Genetics & Breeding
This multiple choice question is from Animal Genetics & Breeding, Animal Refresher. It has 4 options with a detailed explanation of the correct answer. Practice more MCQs from Animal Genetics & Breeding to strengthen your preparation.
