Semi-identical (sesquizygous) twinsA 28-year-old woman gave birth to twins in 2014. Her set of twins shared aplacenta, appearing to be identical twins.But the 14-week ultrasound showed they were different genders - making itimpossible 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 chancessurvival?4. Which percentage of their genetic DNA do they share?

When two sperm fertilized a single egg that split into two, then the twins are called semi-identical…

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?

Biology 2e

2nd Edition

ISBN:9781947172517

Author:Matthew Douglas, Jung Choi, Mary Ann Clark

Publisher:Matthew Douglas, Jung Choi, Mary Ann Clark

Chapter12: Mendel's Experiments And Heredity

Section: Chapter Questions

Problem 19RQ: How many different offspring genotypes are expected in a trihybrid cross between parents...

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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?

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