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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 […]

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– […]

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 […]

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 […]

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: […]

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 […]

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 […]

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 The correct answer […]

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 […]

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 […]