Ques 1.

Describe with appropriate examples the role of environment in the determination of sex

Ques 2.

Detail the Watson and Crick model of DNA structure. How did it fit in the data provided by Chargaff?

Ques 3.

Does the operon concept apply to eukaryotes? Describe a suggested mechanism for gene regulation in eukaryotes.

Ques 4.

In a randomly mating laboratory population of Drosophila, 4 per cent of the flies have black bodies (black is autosomal recessive, b) and 96 per cent have brown bodies (normal colour, B). If this population is assumed to be in Hardy-Weinberg equilibrium, what are the allelic frequencies of B and b, and the genotypic frequencies of BB and Bb?

Ques 5.

Detail the molecular basis of mutations.

Ques 6.

Enlist the different types of lymphocytes. Mention their function, site of differentiation, and the type of immunity imparted by them

Ques 7.

Describe any two modern methods for the improvement of crop plants

Ques 8.

In peas, Tall (T) is dominant over dwarf (t), Yellow is dominant over green (y), and Smooth (S) is dominant over wrinkled (s). What fraction of the offspring in the following cross would be homozygous recessive for all gene pairs in the cross: YyTtss  YyttSs?

Ques 9.

How linkage maps are constructed? What is their use in genetic studies?

Ques 10.

How many linkage groups would be revealed by an analysis of human genome?
Choose the correct answer amongst the choices given below:
i) 2
ii) 13
iii) 23
iv) 46

Ques 11.

Determine the order of genes along a chromosome based on the following
recombination frequencies:
A - B 8 map units
A - C 28 map units
A - D 25 map units
B - C 20 map units
B - D 33 map units

Ques 12.

Somatic and gametic mutations

Ques 13.

Structural and regulatory genes

Ques 14.

Euchromatin and heterochromatin

Ques 15.

Cell-mediated and humoral immunity

Ques 16.

Lytic and Iysogenic cycles