A 28-year-old woman gave birth to twins in 2014. Her set of twins shared a placenta,...

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Biology

A 28-year-old woman gave birth to twins in 2014. Her set oftwins shared a placenta, appearing to be identical twins.
But the 14-week ultrasound showed they were different genders-- making it impossible for them to be monozygotic twins.
These twins were formed when a single egg was fertilized bytwo sperm.
1. How many types of twins do exist?
2. What are \"semi-identical\" twins, and why are they sorare?
3. If this happen, do these embryos have fair chances ofsurvival?
4. Which percentage of their genetic DNA do they share?

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4.4 Ratings (809 Votes)

Ans1 twins are mainly of 2 types 1 Monozygotic twins Here a single zygote formed by fusion of one sperm and one egg splits after fertilization giving rise to 2 embryo Such twins will be identical will have same gender and will also be genetically identical 2 Dizygotic twins Here 2 zygote are See Answer

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