Statement - 1: Single gene exhibiting two or more traits is referred as polygenic trait.
Statement - 2: In a polygenic trait, phenotype reflects contribution of each allele i.e. effect of each allele is additive.

Which of the following statements is / are correct for a polygenic inheritance ? 1. They show uniformity. 2. Controlled by three or more genes. 3. It is not influenced by the environment . In polygenic inheritance, phenotype reflects the contribution of recessive allele only .

If a polygenic trait is controlled by 3 polygenes, what will be F_(2) phenotypic ratio?

The type of inheritance in which many traits of a character are spread across a gradient and the effect of each allele is additive, is

Assertion : A gamete contains a single allele for each trait. Reason : During gametogenesis, the two alleles of each trait segregate, on passing into each gamete at random.

In a long term experiment of a population of Drosophila melnogaster, the frequency of two alleles 'a' and 'b' of a multi-allelic locus X over time has been shown in the following graph. 6 students were asked to evaluate the observed pattern and their inferences are given below. Statement 1: Enviorment is not uniformly slective. Statement 2: Population may be under artificial selection. Statement 3: Genetic variability is progressively reduced. Statement 4: Genetic varuability is progressively increased. Statement 5: Mechanism such as genetic drift is operating from time to time. Statement 6: Selection is favouring a particualr genotype through directional selection. The appropriate conclusions were draws by

Statement-1(Assertion) and Statement-2 (reason) Each of these question also has four alternative choices, only one of which is the correct answer. You have to select the correct choice as given below. (a) Statement-1 is true, Statement-2 is true, Statement-2 is a correct explanation for Statement-1 Statement-1 is true, Statement-2 is true, Statement-2 is not a correct explanation for Statement -1 (c) Statement -1 is true, Statement -2 is false (d) Statement -1 is false, Statement -2 is true Statement -1 The equation (logx)^2+logx^2-3=0 has two distinct solutions. Statement-2 logx^(2) =2logx.

If a particular trait is controlled by 2 gene pairs (polygenic), then calculate the total number of phenotypes and genotypes in F_(2) generation.

Given below are assertion and reason. In humans the gamete contributed by the male determines whether the child produced will be male or female. Reason. Sex in humans is polygenic trait dependent upon the com ulative effect of some genes on X-chromosome and some on Y-chromosome. Point out if both re true with reason being correct explanation (A). Both are true but reason is not correct explanation (B), assertion is true but reason is wrong (C ) and bothare wrong (D). Assertion .

Read the given statements and select the correct option. Statement 1 : The cloning vector is required to have very few, preferably single, recongnition sites for the commonly used restriction enzymes. Statement 2: Presence of more than one recongnition sites within a cloning vector will generate several fragments, which will complicate the process of gene cloining. 1) Both statements 1 and 2 are correct 2) statement 1 is correct but statement 2 is incorrect 3) statement 1 is incorrect but statement 2 is correct 4) None of the above

Statement I: The lines from the vertex to the two extremities of a focal chord of the parabola y^2=4ax are perpendicular to each other. Statement II: If the extremities of focal chord of a parabola are (at_1^2,2at_1) and (at_2^2,2at_2) , then t_1t_2=-1 .