Q 5) Justify why you agree/disagree with following statement (1)
a) A population at zygotic phase equilibrium is also at gametic phase equilibrium but the converse need not be true.
b) A population at equilibrium considering two loci simultaneously is also at equilibrium considering loci individually but the converse need not be true.
Q 6) Derive and show that a population at gametic phase equilibrium attains joint equilibrium after one generation of random mating (2)
Q. 7)
a) Explain with derivations and examples how it is difficult to bring improvement for yield, in both self and cross-pollinated crops when yield influencing loci show positive over-dominance. (4)
Q 8) Answer Precisely
a) Bring out how during the course of restricted random mating consequences seen in a sub-population and the total large population are similar/differing.
b) Why alleles responsible for inbreeding depression do not express themselves as long as maize population is subjected to random mating and why are they expressed so conspicuously when the same maize population is subjected to inbreeding?
c) A locus influencing yield is showing additive gene action and the population is subjected to selection for high yield? What is the change in gene frequency observed and response shown by a population in one generation and continuously over generations?
d) What is meant by unstable equilibrium? What are the conditions of direction of dominance, desirable direction of selection leading to unstable equilibrium?
e) Derive and show how frequency of homozygotes in the entire population increases due to restricted random mating.
Q 9) Give the meaning of following terms. (3)
a) Selection coefficient and fitness
b) Idealized situation of restricted random mating
c) Wahlund’s frequencies
d) Bruce’s frequencies
e) Law of Constancy of allelic frequency
f) Polygenic equilibrium
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