Question
Twins are born to a family that lives next door to you. The twins are a boy and a girl. Which of the following must be true?
NEET
Zoology
Human Reproduction
2025
NEET 2025
NEET Zoology Question (2025) — Solution
Options
- A. They are monozygotic twins.
- B. They are fraternal twins.
- C. They were conceived through in vitro fertilization.
- D. They have 75 \% identical genetic content.
Answer
B. They are fraternal twins.
Step-by-step solution
Fraternal twins or dizygotic twins are 2 separate fertilized eggs, they usually develop 2 separate amniotic sacs, placentas and supporting structures. If twins are a boy and a girl, this indicates they are fraternal twins.
Related: Zoology — Human Reproduction · All PYQ Banks