LOYOLA COLLEGE (AUTONOMOUS), CHENNAI – 600 034

B.Sc. DEGREE EXAMINATION – ZOOLOGY

TS 12

FIFTH SEMESTER – APRIL 2007

ZO 5501 – GENETICS

 

 

 

Date & Time: 28/04/2007 / 1:00 – 4:00 Dept. No.                                              Max. : 100 Marks

 

 

PART-A

Answer ALL.                                                                                                            (10×2=20 marks)

 

1. What are Euthenics, Eugenics and Euphenics.
2. Give an example for complete linkage.
3. What are Hfr Cells.
4. When a normal woman whose father is a colorblind is married to a colorblind man.

Find out the possible colorblind condition in their progeny.

5. Define the following.
6. Cistron b. Recon
7. What is a phage?
8. Define Amniocentesis.
9. Find the result of the following crosses.
10. AO x BO b. AB x OO
11. Find out the gene frequency of A and a. Where the genotype frequency of ‘a’ is 0.64.
12. Give the phenotypic and genotypic ratios of a dihybrid Mendelian cross.

 

PART-B

 

Answer any FOUR.                                                                                               (5×8=40 marks)

 

11. Write a paragraph on Gene Mutations.
12. Discuss out breeding and its advantages.
13. Explain the X-linked inheritance with suitable examples.
14. Define Maternal Inheritance with suitable examples.
15. What is linkage? Classify types of linkage with examples.
16. What is non-disjunction? Explain with klinefelter’s syndrome as the example.

PART-C

Answer any TWO.                                                                                        (2×20=40 marks)

 

17. a. Define Hardy Weinberg’s Law.
18. Explain in detail the gene and genotype frequencies.
19. Elaborate the factors affecting HW Law of equilibrium.
20. Explain in detail the mendel’s laws of inheritance.
21. Write an essay on multiple alleles with suitable examples.
22. a. What is human genome project.
23. Explain in detail the merits and demerits of the project.

 

 

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