Types of Twins: Monozygotic vs Dizygotic

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Questions and Answers

What is the main genetic difference between monozygotic and dizygotic twins?

  • Monozygotic twins share 25% of their genetic material, while dizygotic twins share 75%.
  • Monozygotic twins share 100% of their genetic material, while dizygotic twins share only about 50%. (correct)
  • Monozygotic twins share 50% of their genetic material, while dizygotic twins share 100%.
  • Monozygotic twins share 75% of their genetic material, while dizygotic twins share 25%.

Which condition can arise when monozygotic twins share a single placenta?

  • Amniotic sac deficiency
  • Twin-to-twin transfusion syndrome (correct)
  • Genetic imbalance disorder
  • Placenta sharing syndrome

What environmental factors can influence both monozygotic and dizygotic twins?

  • Mother's age, weight, and lifestyle choices (correct)
  • Sibling's age, weight, and lifestyle choices
  • Father's age, weight, and lifestyle choices
  • Grandparents' age, weight, and lifestyle choices

In terms of appearance and health outcomes, what may contribute to differences between monozygotic twins?

<p>Environmental factors and genetic mutations (C)</p> Signup and view all the answers

How do dizygotic twins develop compared to monozygotic twins?

<p>From two separate eggs fertilized by two different sperm (C)</p> Signup and view all the answers

What is the difference in the genetic material shared by monozygotic and dizygotic twins?

<p>~50% (D)</p> Signup and view all the answers

How do monozygotic twins develop from a genetic standpoint?

<p>~50% shared genetic material due to single fertilization (C)</p> Signup and view all the answers

Which factor may not necessarily contribute to differences in appearance between monozygotic twins?

<p><em>Food availability</em> (B)</p> Signup and view all the answers

Influence on growth and development of twins can vary based on what factor?

<p><em>Number of amniotic sacs and placentas they share</em> (A)</p> Signup and view all the answers

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