Monozygotic twins share approximately what percentage of their DNA?

Unlock all questions

This demo includes only 20 questions. Upgrade to access hundreds of questions, flashcards, exam simulations, and disable ads.

Full question bankExam simulationsFlashcards
From $24.99Unlock all

Boost your readiness for the AQA Approaches in Psychology exam. Study with comprehensive flashcards and varied multiple-choice questions. Analyze hints and detailed explanations. Seamlessly prepare for your success!

Multiple Choice

Monozygotic twins share approximately what percentage of their DNA?

Explanation:
Identical twins come from a single fertilized egg that splits early in development, so they inherit essentially the same genetic material. Because the same DNA is shared by both embryos, they have about 100% of their DNA in common. The other options don’t fit that biology: 50% is what you’d expect for regular siblings or fraternal twins, 0% would mean no shared genes, which isn’t possible for twins from one zygote, and 25% would resemble the level of sharing seen in half-siblings. In reality, there can be tiny differences due to post-zygotic mutations or epigenetic changes, but the baseline genetic overlap is effectively complete.

Identical twins come from a single fertilized egg that splits early in development, so they inherit essentially the same genetic material. Because the same DNA is shared by both embryos, they have about 100% of their DNA in common. The other options don’t fit that biology: 50% is what you’d expect for regular siblings or fraternal twins, 0% would mean no shared genes, which isn’t possible for twins from one zygote, and 25% would resemble the level of sharing seen in half-siblings. In reality, there can be tiny differences due to post-zygotic mutations or epigenetic changes, but the baseline genetic overlap is effectively complete.

More Multiple Choice Questions
Subscribe

Get the latest from Examzify

You can unsubscribe at any time. Read our privacy policy