GPB MCQ Quiz 157 for ICAR JRF/SRF/ARS Exam Preparation

The theory which states that crossing over takes place due to breakage and reunion of non-sister chromatids is

A) Breakage and reunion theory

B) Copy choice theory

C) Classical theory

D) None of the above

Explanation: The breakage and reunion theory explains crossing over as the exchange of segments between non-sister chromatids of homologous chromosomes.

Gene transfer can be achieved by

A) Via plasmid and through direct uptake

B) Particle bombardment and micro injection

C) By micro injection and through direct uptake

D) By all of the above

Explanation: Gene transfer can be achieved using various methods including plasmid-mediated transfer, direct uptake, particle bombardment, and microinjection.

In genetics chi-square test is applied for the purpose

A) To test the validity of various segregation ratio

B) For detection of linkage

C) In study of gene frequencies in population genetics

D) All of the above

Explanation: The chi-square test is used to test the validity of segregation ratios, detect linkage, and analyze gene frequencies in population genetics.

Chi-square cannot properly be applied to distributions in which the frequency of any class is less than

A) 5

B) 6

C) 7

D) 10

Explanation: The chi-square test is not reliable when the expected frequency in any category is less than 5.

Statistical procedure which are used for the polygenic trait analysis are

A) Arithmetic mean, Measures of dispersion, Analysis of variance

B) Analysis of variance, Analysis of co-variance, Tests of significance

C) Correlation analysis, Regression analysis, Tests of significance

D) All of above

Explanation: Polygenic trait analysis uses multiple statistical procedures including mean, variance, correlation, regression, and tests of significance.

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