1. How many types of twins do exist? 2. What are "semi-identical" twins, and why are they so rare? 3. If this happen, do these embryos have fair chances of survival? 4. Which percentage of their genetic DNA do they share?
1. How many types of twins do exist? 2. What are "semi-identical" twins, and why are they so rare? 3. If this happen, do these embryos have fair chances of survival? 4. Which percentage of their genetic DNA do they share?
Human Anatomy & Physiology (11th Edition)
11th Edition
ISBN:9780134580999
Author:Elaine N. Marieb, Katja N. Hoehn
Publisher:Elaine N. Marieb, Katja N. Hoehn
Chapter1: The Human Body: An Orientation
Section: Chapter Questions
Problem 1RQ: The correct sequence of levels forming the structural hierarchy is A. (a) organ, organ system,...
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![Semi-identical (sesquizygous) twins
A 28-year-old woman gave birth to twins in 2014. Her set of twins 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 by two sperm.
1. How many types of twins do exist?
2. What are "semi-identical" twins, and why are they so rare?
3. If this happen, do these embryos have fair chances
survival?
4. Which percentage of their genetic DNA do they share?](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2F86a84ac2-4b23-4a71-a318-5815b7512d03%2F201866a5-8aca-42c4-99d1-071b9aea9ab8%2Fdf24oba_processed.jpeg&w=3840&q=75)
Transcribed Image Text:Semi-identical (sesquizygous) twins
A 28-year-old woman gave birth to twins in 2014. Her set of twins 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 by two sperm.
1. How many types of twins do exist?
2. What are "semi-identical" twins, and why are they so rare?
3. If this happen, do these embryos have fair chances
survival?
4. Which percentage of their genetic DNA do they share?
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