A low sperm count, or lack of sperm, is the most common infertility problem in men.
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Q2: Amniocentesis is a procedure used in abortion.
Q5: Typical human cells contain 50 chromosomes organized
Q7: Color blindness is a sex-linked abnormality.
Q7: Sperm are much larger than ova.
Q9: Rh incompatibility occurs when an Rh-positive woman
Q11: Monozygotic (MZ) twins are known as fraternal
Q12: Duchenne muscular dystrophy is a sex-linked abnormality.
Q15: As women reach the end of their
Q17: Sebaceous glands cause a developing organism to
Q20: The fetus begins to turn and respond
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