INBO Genetics Questions with Solutions, Download PDF

INBO Genetics Questions : Genetics is a fundamental branch of biology. It explains heredity and variation  in living organisms. For competitive exams like INBO, genetics holds significant importance. It forms a core part of the syllabus, covering molecular, classical, and population genetics. Questions often test deep conceptual understanding and application. Here provides a set of carefully selected INBO Genetics Questions from previous preparation materials.

This resource helps students prepare effectively for the INBO exam. It offers practice with relevant question types and solutions. By studying these important questions, students will enhance their problem-solving abilities. They will also gain clarity on challenging genetic principles. This blog is a valuable tool for reinforcing learning and improving exam performance. These INBO Genetics practice questions are crucial for success.

Also Read: INBO Syllabus

INBO Genetics Important Questions

This section presents a collection of important INBO Genetics Questions with detailed answers. These questions are designed to cover various topics and question patterns relevant to the INBO competitive examination based on INBO Genetics previous year questions. Practice these INBO Genetics MCQs strengthens your understanding of genetics.

1. A female cat with a mutant phenotype was bred with a wild-type male cat. All progeny (4 males and 4 females) show the mutant phenotype. On the other hand, all progeny (4 males and 4 females) from the reciprocal cross between a mutant male and a wild-type female show the wild-type phenotype. Which of the following explain the inheritance pattern of the mutation?
   (A) Recessive
   (B) Linked inheritance
   (C) Mitochondrial inheritance
   (D) Autosomal inheritance
   Answer: (C)

2. An experiment involving bacterial conjugation between an Hfr strain and an F-strain was conducted. Interrupted mating was used to map the genes. After 10 minutes of conjugation, the F-cells were found to have acquired the genes in the following order: A, B, C. Which conclusion can be drawn about the relative positions of these genes on the bacterial chromosome?
   (A) Genes A, B, and C are closely linked, with gene A closest to the origin of transfer, followed by B and C.
   (B) Gene C is closest to the origin of transfer, followed by B and A, indicating a reverse order of gene acquisition.
   (C) The order of gene acquisition cannot be determined without knowing the specific recombination frequencies.
   (D) Gene B is the furthest from the origin of transfer, indicating it was transferred last, with A and C being closer.
   Answer: (A)

3. When a plant of chromosomal type aa pollinates a plant of type AA, what chromosome constitution of embryo and endosperm is expected in the resulting seeds:
   (A) Diploid zygote of type Aa and Triploid endosperm of type AAa
   (B) Diploid zygote of type aa and Triploid endosperm of type Aaa
   (C) Diploid zygote of type AA and Triploid endosperm of type AAa
   (D) Diploid zygote of type Aa and Triploid endosperm of type aaa
   Answer: (A)

4. In a testcross between a heterozygous individual for three linked genes (ABC/abc) and a homozygous recessive individual (abc/abc), the following progeny were observed:
   Parental types: 70%
   Single recombinants: 25%
   Double recombinants: 5%
   What is the approximate distance in centimorgans (cM) between genes A and C?
   (A) 50 cM (B) 30 cM
   (C) 48 cM (D) 15 cM
   Answer: (B)

5. A tetrad analysis shows that among 100 tetrads analyzed, there are 50 parental ditype, 30 tetratype, and 20 non-parental ditype tetrads. What can be deduced about the linkage between the two genes being studied?
   (A) The genes are likely unlinked and assort independently based on the equal distribution of tetrad types.
   (B) The ratio indicates that the genes are linked, with significant recombination occurring.
   (C) The predominance of parental ditype suggests that the genes are tightly linked with little recombination.
   (D) The presence of non-parental ditype suggests that there is a high frequency of crossovers between the genes.
   Answer: (C)

6. In a plant species, flower color purple is dominant over white. One such purple-flowered plant upon selfing produced 35 viable plants, of which 9 were white-flowered and the rest were purple flowered. What fraction of these purple flowered progeny is expected to be pure purple flowered line?
   (A) 1/2 (B) 1/3
   (C) 1/4 (D) 2/3
   Answer: (B)

7. Which of the following statements about sex determination mechanisms in reptiles is accurate?
   (A) All reptilian species employ the XX-XY chromosomal system, with males consistently being heterogametic.
   (B) Temperature-dependent sex determination (TSD) can cause variations in sex ratios among offspring, depending on incubation conditions, influencing population dynamics in certain species.
   (C) The genetic mechanisms for sex determination in reptiles are universally fixed, with no variation across different taxa, independent of environmental influences.
   (D) Temperature-dependent sex determination occurs exclusively in female reptiles, with males developing under consistent temperature ranges.
   Answer: (B)

8. A linkage map of a chromosome shows that gene C is located 10 cM from the centromere and gene D is located 40 cM from the centromere on the same chromosome arm. Assuming no recombination occurs, what is the most likely genetic outcome for the inheritance of these genes?
   (A) Gene C and gene D will be inherited together in 100% of gametes
   (B) Gene C and gene D will show no linkage due to distance
   (C) Gene C will always be inherited separately from gene D
   (D) Gene C will segregate more frequently with other centromeric genes than gene D
   Answer: (D)

9. In knockout mice experiment was performed for germline transmission of gene A, null allele from a male chimera shows retarded growth of all mutant heterozygotes. On inbreeding animals produced the expected ratio of heterozygote pups but only 50 percent of heterozygote are with retarded growth of phenotype. These results are consistent with the following
   (A) Genomic imprinting
   (B) Sex linked inheritance
   (C) Cytoplasmic inheritance
   (D) Co-dominance
   Answer: (A)

10. The inheritance pattern of a common trait which shows complete penetrance is shown below: Based on the above pedigree, fill in the blanks from the options given below:
    "The trait is (A). The probability that a child from the marriage of individual III-1 and III-2 will show the trait is (B) considering that the individual III-1 is a carrier of the trait."
    (A) Y-linked, 0 (B) Y-linked, 1/2 (C) Autosomal, 1/8 (D) Autosomal, 1/6
    Answer: (D)

INBO Genetics Questions PDF Download

A comprehensive PDF featuring these INBO Genetics Questions and their solutions is available for download. This PDF includes additional INBO Genetics solved questions and helpful study notes to further aid your preparation. Use this INBO Genetics questions pdf for offline study.

How to Use INBO Genetics Solved Question Papers for Exam Preparation

Using these solved genetics questions strategically can significantly boost your INBO preparation. Follow these steps for effective learning:

• Review Concepts Thoroughly: Before attempting each section, revisit the core genetic concepts. Ensure you understand topics like Mendelian inheritance, gene regulation, and molecular biology basics.

• Attempt Questions First: Try to solve each question independently before checking the answer. This helps identify areas where your understanding is weak.

• Analyze Correct Solutions: For every question, understand why the given answer is correct. Do not just memorize it. Pay attention to the reasoning provided.

• Learn from Mistakes: If you answer incorrectly, go back and review the related theory. Understand the specific concept you missed or misunderstood.

• Practice Regularly: Consistent practice with INBO Genetics practice questions builds speed and accuracy. Regular revision of these solved problems reinforces learning.

• Time Management: As you get closer to the exam, practice solving questions under timed conditions. This improves your exam temperament.