1. Choose the correct statement**
(i) The differences among individuals of a single species for a character is called as variation
(ii) Transgressive segregants fall outside the limits of both parents
(iii) Nilsson-Ehle provided the genetic basis for transgressive segregation in wheat and oats.
(iv) All of these
2. Term Polygene and oligogene was given by**
(i) Yule (1906)
(ii) East (1916)
(iii) Nilsson-Ehle (1908)
(iv) Mather (1941)
3. Qualitative character is also called as**
(i) Oligogenic trait
(ii) Major gene character
(iii) Monogenic trait
(iv) All of these
4. Quantitative character is also called as**
(i) Multiple factor character
(ii) Polygenic trait
(iii) Minor gene character
(iv) All of these
5. Choose the correct statement**
(i) Quantitative character is also called as variable character
(ii) Hidden (Potential) variability from homozygotes is released by out crossing
(iii) Potential variability from heterozygotes is released by selfing or inbreeding
(iv) All of these
6. Choose the correct statement**
(i) Polygenic traits are measured in terms of colour, shape, surface, size etc.
(ii) Oligogenic characters are measured in terms of height and weight, length and width, duration etc.
(iii) Transgressive segregation is possible in polygenic trait
(iv) All of these
7. Genetic variability can be created by
(i) Somaclonal variation and somatic hybridization through protoplast fusion
(ii) Mutagenesis and polyploidy
(iii) Sexual hybridization
(iv) All of these
8. Choose the incorrect statement
(i) Transgressive segregants are only possible from the cross between two parents with mean values for a quantitative trait
(ii) Transgressive segregation is the production of plants in F₂ generation that are superior to both the parents for one or more characters
(iii) Transgressive segregation is possible in oligogenic trait
(iv) During the transfer of a polygenic trait through backcross method, F₁ and F₂ generations are raised after each backcross generations
9. Choose the incorrect statement
(i) Aabb × aaBB crosses will produce transgressive segregation in the F₂ generation
(ii) Total variation present in a population arises due to genotypic and environmental effects
(iii) According to Mendel, plant height is qualitative characters, but usually plant height is quantitative characters and highly sensitive to the environmental factors
(iv) The continuous variation in monogenic trait are due to the cumulative effect of several genes and marked effect of environment on the expression of the characters
10. Choose the incorrect statement
(i) When magnitude of effect of the environment on phenotype increases, the phenotypic classes progressively overlap each other and form continuous variation
(ii) Polygenic characters show variable magnitudes of heritability and environment plays an important role in the development of such traits
(iii) The linkage among polygenes leads to slow release of potential variability
(iv) Transfer of a polygenic trait through backcross procedure is much easier as compared to that of a monogenic trait
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