Category: CSIR NET Life Science Previous Year Questions and Solution on QUANTITATIVE GENETICS

Category: CSIR NET Life Science Previous Year Questions and Solution on QUANTITATIVE GENETICS

CSIR NET Life Science Previous Year Questions and Solution on QUANTITATIVE GENETICS

17. A disease-resistant plant was crossed With a susceptible plant and the resultant F1 plants were disease resistant. The F1 plant was seifed and the F2 individuals were analyzed for qualitative and quantitative disease resistance. The following statements were hypothesized A. Qualitative resistance follows Mendelian ratio. B. In the F2 individuals demonstrating qualitative resistance, "resistance" is dominant C. Quantitative resistance is always monogenic D. Qualitative resistance can be polygenic Which one of the following combination of statements is correct? (1) A, C and D (2) A, B, and C (3) A, B and D (4) B, C and D

Understanding Qualitative and Quantitative Disease Resistance in Plants

16. Two inbred lines of beans were intercrossed. In F1 the variance in bean length was measured as 2.0. The F1 was selfed to obtain F2 and the variance in bean length in F2 was 7.0. The broad heritability of bean length in the F2 population will be: (1) 0.75 (2) 9.0 (3) 5.0 (4) 0.71

How to Calculate Broad-Sense Heritability in F2 Population Using Variance in Beans

15. Body weight of rabbits is determined by pairs of alleles at two loci, 'a' and ‘b’ that are additive and equal in their effects. Rabbits with genotype a- a- b- b- have average 1 kg body weight, whereas individuals with genotype a+ a+ b+ b+ have animals that average 3.4 kg in weight. A male rabbit with a- a- b- b- crossed with a female of genotype a+ a+ b+ b+ What will be predicted average weight of F1 progeny of this cross? (1) 2.2 kg (2) 1.6 kg (3) 1.2 kg (4) 2.8 kg

Predicting Rabbit Body Weight from Additive Gene Action at Two Loci

14. Two pure line of corn have mean cob length of 9 cm and 3 cm, respectively. The polygenes involved in this trait exhibit additive gene action. Crossing these two lines is expected to produce a progeny population with mean cob length of (1) 12.0 cm (2) 7.5 cm (3) 6.0 cm (4) 2.75 cm

Predicting Progeny Cob Length by Additive Gene Action in Corn

13. Two varieties of maize averaging 48 and 72 inches in height, respectively, are crossed, The F1 progeny is quite uniform averaging 60 inches in height. Of the 500 F2 plants, the shortest 2 are 48 inches and the tallest 2 are 72 inches. What is the probable number of polygenes involved in this trait? (1) Four. (2) Eight (3) Sixteen. (4) Thirty two

How to Estimate Number of Polygenes Affecting Maize Height from F2 Plant Data

12. Wheat plants can have kernels of white colour or in shades of red i.e. light red, red, dark red and very dark red (purple). A researcher made the following cross: P Wheat plants Wheat plants with with white X purple (very dark red) kernals kernals F1 All plants with red kernals F2 1/16 Plants with purple kernals 4/16 Plants with dark red kernals 6/16 Plants with red kernals 4/16 Plants with light red kernals 1/16 Plants with white kernals The following conclusions are made from the results obtained: A. It is a dihybrid cross where white colour is coded by gene A and the purple colour is coded by gene B B. Two genes, both cod'ng for the colour of kernel and each gene having two alleles, one that produced red pigment and the other that produced no pigment. C. Four genes, one coding for no pigment. which is epistatic over the other genes. The remaining three genes have 2 alleles each, one that produced red pigment and the other that produced no pigment. D. The trait is influenced by the environment leading to the observed variation in kernel colour. Which of the above conclusion(s) is/are correct? (1) A only (2) B only (3) C only (4) C and D only

Polygenic inheritance of wheat kernel colour

11. The total variance in a phenotypic character can be split into two components - genetic (VG) and environmental (VE). The heritability of a phenotypic trait can be expressed quantitatively as heritability coefficient (h2) which is calculated as h2 = (1) VG-VE (2) VE/VG (3) VG/VG+VE (4) VG/VG-VE

Understanding Heritability Coefficient (h2) and Its Calculation in Genetics

10. Which one of the following statements is true regarding heritability of a quantitative character? (1) The estimate obtained from a given population and in one set of environment can be extrapolated to other population and sets of environment (2) The estimate is a population as well as an individual parameter. (3) Heritability measures the proportion of the phenotypic variation that is the result of genetic factors (4) Heritability indicates the degree to which a trait is genetic.

Understanding Heritability of Quantitative Characters

9. Interacting genes which are involved in producing continuous variation in phenotypes in a population are known as/constitute (1) codominant genes (2) pseudogenes (3) alleles (4) QTLs

QTLs: The Genes Behind Continuous Phenotypic Variation

8. In an experiment, clones of a plant is grown in a field. The plants were observed to be of different heights. When a graph was plotted for frequency of plants (Y- axis) against different heights (X-axis), a bell-shaped curve was obtained. From the above, it can be concluded that the observed variation in height is due to (1) it being a polygenic trait (2) environmental effect (3) variation in genotype. (4) influence of environment on different genotypes

Why Do Cloned Plants Show Different Heights?

7. A new trait was found to be highly variable in a population, It showed a bell-shaped distribution and is shown to be influenced by environmental factors. The trait can be (1) a monogenic trait (2) a polygenic trait (3) a norHU1antitative trait (4) due to point mutation in the regulatory region Of a gene

Understanding the Basis of Highly Variable Traits with Bell-Shaped Distribution

6. Which one of the following statements is INCORRECT? (1) Quantitative inheritance results in a range of measurable phenotypes for a polygenic trait. (2) Polygenic traits often demonstrate continuous variation. (3) Certain alleles of quantitative trait loci (QTL) have an additive effect on the character/trait. (4) Alleles governing quantitative traits do not segregate and assort independently.

Understanding Quantitative Inheritance and Polygenic Traits

5. Quantitative inheritance are due to (1) Variation in phenotype (2) Variation in genotype (3) Variation in environment (4) Variation in both genotype and environment

Understanding Quantitative Inheritance

4.Polygenic traits in crops can be identified by (1) QTL mapping (2) Cluster analysis (3) Tandem array analysis (4) Gene mapping

How to Identify Polygenic Traits in Crops Using QTL Mapping

3. Mendelian inheritance is obeyed by (1) Quantitative traits (2) Transposons (3) Organelle inheritance (4) Sex linked trait

Understanding Mendelian Inheritance and Its Applicability to Different Genetic Traits

1. The phenomenon that progeny of diverse varieties of a species or crosses between species exhibit greater biomass. speed of development, and fertility than both parents is termed as (1) Dominance (2) Over dominance (3) Mid parental value (4) Heterosis

Understanding Heterosis

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