Question: You have discovered a true-breeding strain of flies in which 2˚ nondisjunction of the X chromosom…

You have discovered a true-breeding strain of flies in which 2˚
nondisjunction of the X chromosome occurs 20% of the time.

If a true-breeding wildtype female from this strain is crossed
to a male who has scalloped wings (an X-linked recessive trait),
what percentage of fertilizations will result in the production of
scalloped males?

B. How would your answer to (a) differ
if the strain experienced 1˚ nondisjunction 20% of the time?

C. How would your answer to (b) differ
if a wildtype male from the nondisjunctional strain was crossed to
a female expressing scalloped?