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Questions and Answers
Identical twins develop from one zygote, while fraternal twins develop from separate eggs.
Identical twins develop from one zygote, while fraternal twins develop from separate eggs.
- False
- True (correct)
What is the term for twins that share the same mother but have different fathers?
What is the term for twins that share the same mother but have different fathers?
- Monozygotic twins
- Identical twins
- Heteropaternal superfecundation (correct)
- Dizygotic twins
What is the general term for one offspring of a multiple birth?
What is the general term for one offspring of a multiple birth?
- Singleton (correct)
- Fraternal twin
- Doppelgänger
- Multiple
What is the human twin birth rate in the United States in 2009?
What is the human twin birth rate in the United States in 2009?
What are unrelated look-alikes whose resemblance parallels that of twins called?
What are unrelated look-alikes whose resemblance parallels that of twins called?
Flashcards
Identical Twins
Identical Twins
Twins that originate from a single zygote (fertilized egg) that splits into two separate embryos.
Heteropaternal Superfecundation
Heteropaternal Superfecundation
Twins resulting from two separate eggs fertilized by sperm from two different fathers.
Singleton
Singleton
Term for a single offspring from a pregnancy, as opposed to multiple births like twins or triplets.
Doppelgängers
Doppelgängers
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Study Notes
Types of Twins
- Identical twins develop from one zygote, sharing the same DNA.
- Fraternal twins develop from separate eggs, each with their own DNA.
Multiple Birth Terms
- The term for twins that share the same mother but have different fathers is heteropaternal twins.
General Terms
- The general term for one offspring of a multiple birth is multiple.
Twin Birth Rate
- In 2009, the human twin birth rate in the United States was 33.9 per 1,000 births.
Unrelated Look-alikes
- Unrelated individuals who resemble each other, similar to twins, are called doppelgangers.
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