Q 3) Give meaning of following terms. (4)
- Recurrence Relation
- Panmictic Index
- Coefficient of Coancestry
- Effective population size
- Wahlund’s frequency
- Inbreeding coefficient of a population (idealized situation)
- Linkage disequilibrium
- Genetic load
- Heterozygosity
- Polymorphism
- Genetic load
- Polygenic equilibrium
Q 4. Give reasons for why you agree/disagree with the following (5.0)
a) Population at equilibrium considering two loci simultaneously is also at equilibrium considering the loci individually. The converse need not be true.
b) Back crossing is done up to BC5 because plants would be resembling the recurrent parent by this stage.
c) Population at gametic phase equilibrium is also at zygotic phase equilibrium but the converse need not be true.
d) In crops where linked genes are influencing results from selfing shows higher proportion of homozygosity and homozygous individuals than what the formula indicates.
e) What is the effect of smaller effective size handled in BC1.
f) Pedigree method will be effective in spotting most potential transgressive segregant in F2.
g) It is a general rule that successive breeding always leads to increase in proportion of homozygosity
h) Artificial selection in SSD is initiated in F6 because plants would have become homozygous by F6.
i) Differentiate between a) Consequences of selfing and back crossing
j) Distinguish between Constitution of F2 and F6 generation
Q5 Derive the following in case of pedigreed population (3)
a) Formula for working out inbreeding coefficient based on pedigree chart
b) Relation between inbreeding coefficient of an individual and coefficient of coancestries of its grandparents
Q5 Derive and show the following (6)
a) Inbreeding coefficient when Full sib mating occurs first time and its Recurrence relation
b) Genetic load for the population to be at equilibrium when selection favors heterozygotes
c) How a population at gametic phase equilibrium attains zygotic phase equilibrium
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