BSc Biotechnology Sem I 2023 2024 Dec 2024 GENETICS Question Paper - Mumbai University | munotes

Questions asked in this paper

• 1. Attempt all questions

1. Q2 All questions carry equal marks
2. Q4 For Q 2, Q3 and Q 4 attempt A and B OR C and D directed: (Any fifteen) 15 Who is considered the father of genetics? Phenotypic ratio of dominant epistasis
3. Q4 What is the product rule of probability?
4. Q5 Define molecular genetics
5. Q6 If one gene has five alleles, calculate the number of possible genotypes using formula State true or false. Flower color in snapdragons is an example of codominance
6. Q8 Give me an example of gene interaction that leads to new phenotype
7. Q9 Which of the following has been extensively used for genetic analysis?
   • A. Bacillus subtilis
   • B. E.coli
   • C. S.aureus
   • D. Pseudomonas species What are auxotrophs?
8. Q11 State true or false “ E.coli strain with the genotype trp-ade-thi will not grow on Which of the following bacterial recombination process is followed by direct physical contact between two bacterial cells?
   • A. Transformation
   • B. Conjugation
   • C. Transduction None of the above What are competent cells?
9. Q14 State true or false “Virulent phages can follow either lytic or lysogenic pathway”
10. Q15 individuals in a population are homozygous dominant, then the that are expected to be homozygous recessive are
11. Q16 is the branch of genetics which deals with the study of genotype and allelic frequencies in a population
12. Q17 State true or false:- Pitcairn islands are a group of four volcanic islands in the pacific ocean,is an example of the founder's effect Industrial melanism of moths in England is an example of __ phenomenon acting as an evolutionary factor / 20% semester 1 GENETICS 2%Hours 75 Marks / 19. true or False:- Gene pool is the set of all genes in a population
13. Q20 Consider the following statements: A pollen grain from one population is blown to the area of another population where it lands on the pistil of a flower, fertilizing it Il. A bacterium’s gene sequence changes due to a DNA replication error, giving the bacterium resistance to a certain antibiotic Which of the statements describes at least one new allele entering a population?
14. Q2 A How to calculate the probability of genotypes and phenotypes of dihybrid cross with the help of a branch diagram? 8 marks
15. Q2 B Explain the principle of segregation with the help of monohybrid cross. 7 marks
16. Q2 C_ Give a detailed note on multiple alleles with the help of an example. 8 marks
17. Q2 D_ What is epistasis? Explain recessive epistasis with the help of cross. 7 marks
18. Q3 A_ Witha neat labeled diagram give a brief account of an interrupted mating experiment. Define transduction. Add a note on specialized transduction. 07 Define conjugation and transconjugants. Discuss in detail F factor. 08 8 marks
19. Q3 D_ Discuss in detail how a transformation can be used to determine the gene order. 7 marks
20. Q4 A_ Cooke and Ryder (1971) studied the nestiings of Ross’s goose, a small Arctic nesting goose. Goslings (baby geese) exist in two color morphs, White or yellow. Cooke and Ryder reported that a population of geese at Karrack Lake, Canada included 250 white goslings and 750 yellow goslings (1000 total). They assumed that color is controlled by two alleles at a single locus. Calculate the frequencies of all three possible assuming that yellow is dominant and that the population is in 8 marks
21. Q4 B State Hardy- Weinberg Law and explaiii its assumptions. 7 marks
22. Q4 C The geneticist P. M. Sheppard (1959) carried out a selection experiment on laboratory population of the fruit fly Drosophila melanogaster. The stubble allele, (S) which affects the bristle shape of the fly, is dominant to the normal wild-type allele
    • (s) Flies that are homozygous for stubble always die during embryonic development Sheppard started out with 86% normal flies and 14% stubble flies. Calculate the allele frequencies. Calculate the genotype frequencies for the alleles
23. Q4 D_ Read the following passage and answer questions: - Did you know that elephant seals in the Northern Pacific have a signature asymmetrical face that is extremely rare among other populations of elephant seals? This is because an evolutionary force called a bottleneck event acted upon their gene 7 marks

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