Multiple choice Which of the following helps in determining the sex of the offspring in mammals? Spermatogonium Secondary spermatocytes Primary spermatocytes Spermatozoon Spermatids Reveal answer Fill a bubble to check yourself D Correct answer Explanation In mammals, the sex of the offspring is determined by the sperm cell. A spermatozoon bearing a Y chromosome will lead to a male (XY) offspring, while one bearing an X chromosome will lead to a female (XX) offspring.