Fundamentals of Genetics Welcome to your Fundamentals of Genetics 1. The 9:3:3:1 dihybrid ratio is due to Crossing over Homologous pairing Independent assortment Segregation2. Pea plants were used in Mendel's experiments because They had contrasting characters All of the above They were easily available They were cost effective3. DNA structure was discovered by Mendel H.G.Khurana Watson and Crick Lamarck4. A cross was made between tall and dwarf plants. In F1 generation, all plants were tall, when the F1 plants were self pollinated, the tall and dwarf plants appeared in 3:1 ratio in F2 generation. This phenomenon is known as Hybridisation Segregation Dominance Crossing Over5. Which term represents a pair of contrasting characters? Homozygous Heterozygous Codominant genes Allelomorphs6. Genetics is a branch of Biology dealing with Both Heredity and Variation None of these Variation in living beings Heredity in living beings7. The crossing of F1 to any of the parent is known as Test cross All of the above Back cross F1 cross8. When two individuals differing in atleast one character are crossed, the process is known as None Selection Hybridisation Pedigree9. When an individual has both the genes of a contrasting character, it is said to be Homozygous Phenotype Genotype Heterozygous10. The alternative form of a gene is Recessive character Dominant character Alternate type Allele11. The geometrical device that helps to find out all the possible combinations of male and female gametes is known as Mendel square Punnett square Bateson square Crick square12. Who among the following is called the father of Genetics? Mendel Watson and Crick Lamarck Darwin13. Chromosomal aberrations are caused by Change in the arrangement or the position of genes Change in the number of chromosomes Change in the structure of the gene Change in both the number and arrangement of genes14. Mendel's findings were rediscovered by Correns All the above Tschermark De Vries15. The genotypic ratio of a monohybrid cross is 9:3:3:1 2:1:1 3:1 1:2:116. What is the effect of sexual reproduction? Offspring is more vigorous Offspring is diseased Offspring is weak Offspring is like the parents17. Which of the following is true about the "Law of Segregation"? Alleles separate from each other during gametogenesis Law of segregation is the law of purity of gametes Segregation of factors is due to the segregation of chromosomes during meiosis All of the above18. The smallest unit of genetic material which produces a phenotypic effect on mutation is Gene Recon Nucleic acid Muton19. Which one of the following is a phenotypic monohybrid ratio in F2 generation? 2:2 3:1 1:3 1:2:120. An exception to Mendel's law is Linkage Dominance Independent assortment Purity of gametes21 out of 20Please fill in the comment box below.