GPB (506)Population Genetics (Question Paper )

 

 

Q1 Fill up the following blanks by words or format

a) If 80% of the MMCs show crossing over what are the frequencies of different gametes produced by F₁(AB/ab)

• AB ___ Ab ___ aB ___ ab ___

b) Give formulae for Magnitude of variability released in F₂ in terms of No. of genotypic classes

• No of homozygous types ___ Proportion of homozygosity ___ Proportion of homozygous individuals ___

c) The chance of elimination of linked undesirable allele during back crossing is given by ___ and unlinked undesirable allele is ___

d) Inbreeding coefficient when the following regular systems of inbreeding occur for the first time in panmictic G₀ population in

• Selfing ___ Full sib Mating ___ Half sib mating ___ and back crossing to homozygous parent ___ back crossing to equilibrium population ___

e) Recurrence relation with following regular systems of inbreeding in Selfing ___ Full sib Mating ___ Half sib mating ___ and back crossing to homozygous parent ___ back crossing to equilibrium population ___

f) Allelic frequency at stable equilibrium (qₑ) when selection favours heterozygotes ___

g) Proportion of homozygosity in BC₁ generation of a cross AABBccDD X aabbccdd ___

h) Proportion of homozygous plants in F₆ generation n=4 ___

i) Proportion of alleles of P₁ parent in F₆ ___ Minimum population size in F₁₆ ___ Minimum population size in BC₁ ___

j) Proportion of homozygosity in BC₂ ___ Proportion of heterozygosity in F₄ ___

k) Effective population number when selfing is absent ___ Effective population number when males and females are not same ___

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Q2 Correct the sentences if necessary

a) Hardy is called as the father of Population Genetics

b) A population with intermediate allelic frequencies reveals higher inbreeding coefficient on inbreeding as compared to one with extreme allelic frequencies.

c) A population at disequilibrium caused by allelic frequency differences in sex chromosome requires one generation of random mating to attain equilibrium.

d) A population at disequilibrium caused by allelic frequency differences in autosome requires one generation of random mating to attain equilibrium.

e) A population at gametic phase disequilibrium requires two generations to attain zygotic phase equilibrium.

f) If a population is at equilibrium considering two genes simultaneously it is also at equilibrium considering genes individually.

g) If a gene is situated on X chromosome deviation from equilibrium 0.2 becomes ±1 in next generation.

h) Concepts of restricted random mating as an effect of inbreeding were explained by Bruce.