Discuss factors that alter genetic equilibrium in a population.

a. In Drosophila, non-wild type alleles;
x- Vermillion eyes
y – cross veinless (no cross covers I the wings)
z – cut (sniped wing edge)
suppose a three point test cross was conducted involving the following
+/+, z/z, y/y, X, x/x, +/+, +/+
Resultant 8 progeny and types and frequencies were as follows;
x + + 595
+ y z 607
x y + 50
+ + z 45
x y z 94
+ + + 99
x + z 8
+ y + 10
i. Carry out crossing till test cross. (3 marks)
ii. Determine distance between the genes. (12 marks)
b. Briefly describe how one can determine distance between bacterial genes. (5 marks)
2. Discuss factors that alter genetic equilibrium in a population.
3. Discuss Cytoplasmic genetic systems.
4. Describe mutations that cause change in chromosome number.








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