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?
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