LOYOLA COLLEGE (AUTONOMOUS), CHENNAI – 600 034
B.Sc. DEGREE EXAMINATION – ZOOLOGY
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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)
- What are Euthenics, Eugenics and Euphenics.
- Give an example for complete linkage.
- What are Hfr Cells.
- When a normal woman whose father is a colorblind is married to a colorblind man.
Find out the possible colorblind condition in their progeny.
- Define the following.
- Cistron b. Recon
- What is a phage?
- Define Amniocentesis.
- Find the result of the following crosses.
- AO x BO b. AB x OO
- Find out the gene frequency of A and a. Where the genotype frequency of ‘a’ is 0.64.
- Give the phenotypic and genotypic ratios of a dihybrid Mendelian cross.
PART-B
Answer any FOUR. (5×8=40 marks)
- Write a paragraph on Gene Mutations.
- Discuss out breeding and its advantages.
- Explain the X-linked inheritance with suitable examples.
- Define Maternal Inheritance with suitable examples.
- What is linkage? Classify types of linkage with examples.
- What is non-disjunction? Explain with klinefelter’s syndrome as the example.
PART-C
Answer any TWO. (2×20=40 marks)
- a. Define Hardy Weinberg’s Law.
- Explain in detail the gene and genotype frequencies.
- Elaborate the factors affecting HW Law of equilibrium.
- Explain in detail the mendel’s laws of inheritance.
- Write an essay on multiple alleles with suitable examples.
- a. What is human genome project.
- Explain in detail the merits and demerits of the project.
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