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20. Three genes x, y, and z are located on a chromosome in a linear order. If the recombination frequencies between x and y is 0.15, and between y and […]

19. Which one of the following genetic crosses and their results indicates cytoplasmic inheritance? (A) Wild-type male × mutant female → 100% progeny are mutant (B) Wild-type male × mutant […]

18. Which one of the following statements about polyploidy is correct? (A) Autopolyploids are derived from a single species (B) Autopolyploids are derived from two different species (C) Allopolyploids are […]

17. A genetic linkage map represents the (A) relative locations of genes on a chromosome (B) distribution of the mutational hotspots (C) phylogenetic linkage among organisms (D) accurate physical distances […]

16. The inability in humans to taste capsaicin resides in a single gene difference between two alleles P and p. The allele P for tasting is dominant over the nontasting […]

15. The pedigree given below shows individuals affected (shaded circles/rectangles) by chronic hypertension. Assuming 100% penetrance, the inheritance of this trait is (A) autosomal dominant (B) autosomal recessive (C) sex-linked […]

14. In mice, a trait is determined by a dominant allele Y and recessive allele y. What proportion of the offspring from a YY × yy cross is expected to […]

13. In a randomly mating population, the frequency of ‘A’ allele is 0.7. What is the frequency of ‘Aa’ genotype in the next generation according to Hardy-Weinberg’s law? (up to […]

12. How many pairs of autosomal chromosomes are there in normal humans? How Many Pairs of Autosomal Chromosomes Are Present in Normal Humans? Introduction Chromosomes are thread-like structures composed of […]

11. A single copy of an allele in sickle-cell heterozygous individuals reduces the frequency and severity of malaria. The reason for this is (A) Low oxygen binding capacity of hemoglobin […]