1. 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
2. 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
3. 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
4. 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
5. 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
6. Choose the incorrect statement**
(i) In case of most of the quantitative characters, the contribution of environment varies from 10 to 50 percent
(ii) Incomplete penetrance is the result of environment effects
(iii) Incomplete penetrance and variable expressivity are consequences of the effects of environmental factors on the expression of concerned genes
(iv) Linkage between two dominant genes is called as repulsion phase
7. Environmental variance (Ve) can be estimated as**
(i) (VP₁ + VP₂ + VP₃) / 3
(ii) (VP₁ + VP₂) / 2
(iii) (VP₁ + VP₂ − VP₃) / 3
(iv) None of these
8. Variance in F₂ (VF₂) can be calculated as**
(i) Vg + Ve
(ii) Vg − Ve
(iii) (Vg + Ve) / 2
(iv) None of these
9. Choose the incorrect statement**
(i) A gene causing partial chlorophyll deficiency in cotyledonary leaves of lima beans (*Phaseolus lunantus*) at seedling stage shows incomplete penetrance and variable expressivity
(ii) Wheat leaf rust resistance gene *Lr34* shows the resistance to yellow rust, stem rust, powdery mildew and determines leaf tip necrosis deals with Pleiotropy
(iii) Independent assortment deals with segregation of one pair of alleles being independent of that of another pair of alleles resulting in 9:3:3:1 ratio in F₂ and 1:1:1:1 ratio in test crosses
(iv) Law of segregation deals with the alleles governing a trait separate and passes into different gametes during gamete formation in the F₁ hybrids resulting 1:1 ratio in F₂ and 3:1 ratio in test cross
%20(2).png)
0 Comments