7. Which sex determination system is suitable for the following descriptions?
There is only one type of sex chromosome, the females have two sex chromosomes, males have only one sex chromosome.
Sex of the offsprings is determined by whether the sperm cell contains an X chromosome or no sex chromosome.
(A) The X-Y system
(B) The X-0 system
(C) The Z-W system
(D) The haplo-diploid system
(E) None
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