This quiz works best with JavaScript enabled. Home > Class 12 > Class 12 Biology Chapter 5 Principles Of Inheritance And Variation – Quiz 15 🏠 Homepage 📘 Download PDF Books 📕 Premium PDF Books Class 12 Biology Chapter 5 Principles Of Inheritance And Variation Quiz 15 (25 MCQs) Quiz Instructions Select an option to see the correct answer instantly. 1. Out of two alleles of the same gene, only one finds morphological expression. This phenomenon is A) Codominance. B) Complementary. C) Dominance. D) Incomplete dominance. Show Answer Correct Answer: C) Dominance. 2. In certain plant, yellow fruit colour (Y) is dominant to green fruit colour (y) and round shape (R) is dominant to oval shape (r). The two genes involved are located on different chromosomes.Which of the following is correct for the condition when plant YyRr is back crossed with the double recessive parent? A) 9:3:3:1 ratio of phenotypes only. B) 9:3:3:1 ratio of genotypes only. C) 1:1:1:1 ratio of phenotypes only. D) 1:1:1:1 ratio of phenotypes and genotypes. Show Answer Correct Answer: D) 1:1:1:1 ratio of phenotypes and genotypes. 3. A cross between two tall plants resulted in offspring having few dwarf plants. What would be the genotypes of both the parents? A) TT and Tt. B) Tt and Tt. C) TT and TT. D) Tt and tt. Show Answer Correct Answer: B) Tt and Tt. 4. Physical association of 2 or more genes on a chromosome is- A) Recombinantion. B) Crossing over. C) Linkage. D) Assortment. Show Answer Correct Answer: C) Linkage. 5. Conditions of a karyotype 2n $\pm$ $\pm$ A) Aneuploidy. B) Polyploidy. C) Allopolyploidy. D) Monosomy. Show Answer Correct Answer: A) Aneuploidy. 6. A diseased man marries a normal woman. They get three daughter and five sons. All the daughters were diseased and sons were normal. The gene of this disease is? A) Sex linked dominant. B) Sex linked recessive. C) Sex limited character. D) Autosomal dominant. Show Answer Correct Answer: A) Sex linked dominant. 7. If a genetic disease is transferred from a phenotypically normal but carrierfemale to only some of the male progeny, the disease is: A) Autosomal dominant. B) Autosomal recessive. C) Sex-linked dominant. D) Sex-linked recessive. Show Answer Correct Answer: D) Sex-linked recessive. 8. Distance between the genes and percentage of recombination shows: A) A direct relationship. B) An inverse relationship. C) A parallel relationship. D) No relationship. Show Answer Correct Answer: A) A direct relationship. 9. Distance between genes and advantages of recombination shows A) Direct relationship. B) Inverse relationship. C) Parallel relationship. D) No relationship. Show Answer Correct Answer: A) Direct relationship. 10. In sickle-cell anemia, diseased condition occurred due to replacement of amino acid A) Val to Glu. B) Glu to Val. C) Pro to Val. D) None of the above. Show Answer Correct Answer: B) Glu to Val. 11. If a haemophilic man marries a carrier woman then which of the following holds true for their progenies? A) 50% daughters are carrier and 50% are haemophilic. B) All the daughters are haemophilic. C) All sons are haemophilic and all daughters are normal. D) All sons normal, all daughters carriers. Show Answer Correct Answer: A) 50% daughters are carrier and 50% are haemophilic. 12. Which one ofthe following pairs is wrongly matched? A) XO type sex-determination-Grasshopper. B) ABO blood grouping-Codominance. C) Starch synthesis in pea-Multiple alleles. D) TH-Morgan-Linkage. Show Answer Correct Answer: C) Starch synthesis in pea-Multiple alleles. 13. Red green colourblindness is a sex linked trait. Which of the given statements is not correct regarding colourblindness? A) It is more common in males than in females. B) Homozygous recessive condition is required for the expression of colourblindness in female. C) Males can carriers of the trait. D) Colourblind women always have colourblind father and always produce colourblind son. Show Answer Correct Answer: C) Males can carriers of the trait. 14. Choose the wrong statement regarding thalassemia. A) Autosomal recessive disorder. B) Excessive destruction of WBC. C) Beta thalassemia is the common type. D) Gene is located in chromosome 11. Show Answer Correct Answer: B) Excessive destruction of WBC. 15. How many pairs of contrasting characters in pea plants were studied by Mendelssohn in his experiments A) 6. B) 8. C) 7. D) 5. Show Answer Correct Answer: C) 7. 16. A woman with normal vision has a colourblind father. she marries a colourblind man. What proportion of their children will be colourblind? A) 25%. B) 0%. C) 50%. D) 100%. Show Answer Correct Answer: C) 50%. 17. An organism is a hybrid genotype (Tt) but is appears tall instead of short. A) Law of Dominance. B) Law of Segregation. C) Law of Independent Assortment. D) None of the above. Show Answer Correct Answer: A) Law of Dominance. 18. Which of the following is incorrect regarding ZW-ZZ type of sex determination? A) It occurs in birds and some reptiles. B) Females are homogametic and males are heterogametic. C) 1:1 sex ratio is produced in the offsprings. D) All of these. Show Answer Correct Answer: B) Females are homogametic and males are heterogametic. 19. A cross between F$_{1}$ hybrid and its homozygous recessive parent is called A) Out cross. B) Test cross. C) Monohybrid cross. D) Dihybrid cross. Show Answer Correct Answer: B) Test cross. 20. If a diploid organism consists of 20 chromosomes, number of chromosomes in nullisomic condition will be A) 23. B) 18. C) 22. D) 19. Show Answer Correct Answer: B) 18. 21. Select the incorrect statement regarding pedigree analysis. A) Solid symbols show unaffected individuals. B) Proband is the person from which case history starts. C) It is useful for genetic counsellors. D) It is an analysis of traits in several generation of a family. Show Answer Correct Answer: A) Solid symbols show unaffected individuals. 22. Colour blindness in humans A) Results in defect in either red or green cone of eyes. B) Is caused due to the mutation in gene found on X-chromosome. C) Affects males more frequently than females. D) All of the above. Show Answer Correct Answer: D) All of the above. 23. Genes located very close to one another on same chromosome tend to be transmitted together and are called A) Allelomorphs. B) Linked genes. C) Recessive genes. D) Identical genes. Show Answer Correct Answer: B) Linked genes. 24. In which of the sex determination both male and female have same number of chromosomes? A) XY type. B) ZO type. C) XO type. D) Both A & C. Show Answer Correct Answer: A) XY type. 25. Application of Mendel's law is limited to A) When parents are true breeding types. B) Any crosses. C) Linked genes only. D) Very high recombinants. Show Answer Correct Answer: A) When parents are true breeding types. ← PreviousNext →Related QuizzesClass 12 Biology Chapter 5 Principles Of Inheritance And Variation Quiz 1Class 12 Biology Chapter 5 Principles Of Inheritance And Variation Quiz 2Class 12 Biology Chapter 5 Principles Of Inheritance And Variation Quiz 3Class 12 Biology Chapter 5 Principles Of Inheritance And Variation Quiz 4Class 12 Biology Chapter 5 Principles Of Inheritance And Variation Quiz 5Class 12 Biology Chapter 5 Principles Of Inheritance And Variation Quiz 6Class 12 Biology Chapter 5 Principles Of Inheritance And Variation Quiz 7Class 12 Biology Chapter 5 Principles Of Inheritance And Variation Quiz 8Class 12 Biology Chapter 5 Principles Of Inheritance And Variation Quiz 9Class 12 Biology Chapter 5 Principles Of Inheritance And Variation Quiz 10 🏠 Back to Homepage 📘 Download PDF Books 📕 Premium PDF Books