Question

A male fruit fly has three pairs of autosomes as well as an X and a Y chromosome. None of the chromosomes undergoes crossing-over. What fraction of an individual male's gametes will contain only the chromosomes that it inherited from its mother?

Answer 1

Answer:

50% portion are from mother...

Explanation:

If crossing over does not occur then 3 auto-somes as well as one X chromosome shall always come from mother. Even if two XX were present in case of a female 50% of chromosomes shall always be contributed by the mother...