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Human Reproduction
Fertilization and Twinning
1 question from 1 paper, each with its answer.
- question
- 1
- paper
- 1
- years asked, 2017–2026
- 1 of 10
- of Human Reproduction
- 0.86%
Concepts tested
- Fraternal vs Identical Twins
All Questions
2025 1 question
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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?
Opposite-sex twins must arise from two separate ova and sperm, making them fraternal (dizygotic) twins.
Monozygotic (identical) twins develop from a single zygote and must have the same sex and karyotype (both male or both female). A boy and a girl twin set must arise from two distinct fertilizations (dizygotic/fraternal twins).