The diagram shows three sperm and three ova containing sex chromosomes X and Y (not
drawn to scale). Indicate the letters (A to F) of all the sex cells which are normal.

Answer:

19) A, D & E

An egg always has only the X chromosome. So A is correct but B and C are wrong.

A sperm could either have X or Y chromosome (but not both). So D and E are correct but F is wrong.