Question at position 3 What are “dizygotic twins”?Twins who developed from a single fertilized eggTwins who developed from different fertilized eggsTwins who were reared by the same familyTwins who were reared by different families

Question

Question at position 3 What are “dizygotic twins”?Twins who developed from a single fertilized eggTwins who developed from different fertilized eggsTwins who were reared by the same familyTwins who were reared by different families

BlackTom AI · Accepted Answer

To tackle the question, I’ll evaluate what each option claims about dizygotic twins and compare it to the established definition.
Option 1: 'Twins who developed from a single fertilized egg' describes monozygotic (identical) twins, not dizygotic. A single fertilized egg splits to form two individuals with nearly identical genetic material, so this option is incorrect when the term in question is dizygotic.
Option 2: 'Twins who developed from different fertilized eggs' correctly characterizes dizygotic (fraternal) twins. They originate from two separate oocytes that were fertilized by two separate sperm, resulting in genetically distinct siblings who share about 50% of their DNA on average.
Option 3: 'Twins who were reared by the same family' discusses postnatal upbringing rather than origin. Dizygotic vs monozygotic is about fertilization/embryonic development, not family environment, so this option misattributes the concept.
Option 4: 'Twins who were reared by different families' similarly conflates upbringing with the biological mechanism of twinning. The term dizygotic concerns the fertilization events, not their subsequent childcare arrangements, making this option incorrect.
In summary, the only choice that aligns with the biological definition of dizygotic twins is option 2, which states that they developed from different fertilized eggs. The other options describe monozygotic twins or confuse postnatal upbringing with the origin of twinning, which are not accurate for dizygotic twins.

Question at position 3 What are “dizygotic twins”?Twins who developed from a single fertilized eggTwins who developed from different fertilized eggsTwins who were reared by the same familyTwins who were reared by different families单项选择题

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