1. The multiple factor hypothesis was first postulated by
(i) Yule 1906
(ii) Nilsson-Ehle 1908
(iii) East 1916
(iv) Mather 1941
2. The experimental evidence of multiple factor hypothesis was given by
(i) Yule 1906
(ii) Nilsson-Ehle 1908
(iii) East 1916
(iv) Mather 1941
3. Choose the incorrect one
(i) The multiple factor hypothesis - 1:4:6:4:1
(ii) Polymeric gene action - 9:6:1
(iii) Inhibitory gene action - 13:3
(iv) Supplementary gene action - 12:3:1
4. Choose the correct statement
(i) The chief difference between qualitative and quantitative traits lies in the degree to which they are affected by environment
(ii) In most of the quantitative characters, the contribution of environment varies from 10 to 50%
(iii) Xeroderma pigmentosum, disease resistance, allergy etc. are examples of threshold character
(iv) All of these
5. Choose the incorrect statement
(i) Production of new combinations of genes as a result of independent assortment of unlinked genes, crossing over between linked genes or intragenic crossing over is known as recombination
(ii) The F₂ and subsequent generations obtained through continued selfing of a hybrid is known as segregating generations
(iii) The segregation of one pair of alleles being independent of that of another pair of alleles is called as independent assortment
(iv) All of these
6. Who first suggested that, genes controlling quantitative traits are transmitted according to the laws of Mendel
(i) Yule
(ii) Nilsson-Ehle
(iii) Johannsen
(iv) Mather
7. Who first suggested that the development of a character is influenced by both genotype and environment**
(i) Yule
(ii) Nilsson-Ehle
(iii) Johannsen
(iv) Mather
8. Inheritance of both qualitative and quantitative characters follows the law of**
(i) Segregation
(ii) Independent assortment
(iii) Both (i) and (ii)
(iv) None of these
9. Choose the incorrect statement**
(i) Using replicated data from a trial conducted at one location, the phenotypic, genotypic and environmental variance can be estimated
(ii) Ranking of varieties does not change over the environments (only based on differential response of genotypes) denotes quantitative or non-crossover G×E interaction
(iii) Ranking of genotypes changes with the environment denotes qualitative or crossover G×E interaction
(iv) In 1911, Mather discovered the phenomenon of linkage
10. Choose the correct statement**
(i) When a gene influences the expression of more than one character is called as pleiotropy
(ii) Over-dominance and pleiotropy are the chief cause of heterozygotes for sickle cell anaemia are more resistant to malaria than the two homozygotes
(iii) The F₂ and subsequent generations obtained through continued selfing of a hybrid is known as segregating generations
(iv) All of these
11. Choose the correct statement**
(i) Independent assortment of genes is based on random assortment of non-homologous chromosomes
(ii) In case of incomplete dominance genotype is readily known from the phenotype
(iii) A single gene with variable expressivity may produce a number of phenotypes as if more than one gene were involved in the control of the trait
(iv) All of these
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