Biology 207 - Practice questions 11 - Gene interactions
Question 1 In practice question set 8 question 3 what is the relationship between the white
gene and the vermillion gene?
Question 2 The scarlet (st) eye colour gene of Drosophila is on chromosome 3 while the
eyeless (ey) gene is on chromosome 4.
a) If you were to cross flies homozygous for a recessive allele of scarlet (st ) to flies
homozygous for a dominant allele of eyeless (ey ) the F fl1es would have no eyes. What
would you expect the F flies to be if you were to test cross some F females to st /st males?
b) If the frequency of the st mutant allele in a wild population of Drosophila is 5% and the