Which of the Following Is True of Multiple Fetuses

question 11

Multiple Choice

Which of the following is true of multiple fetuses?

• A) Dizygotic twins are a result of a single egg getting fertilized.
• B) Monozygotic twins are never the same sex, whereas dizygotic twins are always the same sex.
• C) Monozygotic twins represent individuals with differing genetic fingerprints.
• D) Dizygotic twins are always identical.
• E) Monozygotic twins result when the fertilized and rapidly dividing egg splits into two within days after conception.

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Definitions:

Urochordates

A subphylum of chordates; includes the tunicates.

Vertebrates

Animals that possess a backbone or spinal column, including fishes, amphibians, reptiles, birds, and mammals.

Hemichordata

A phylum of marine animals that share some traits with chordates, such as a dorsal nerve cord, but have distinct features like a stomochord.

Larval Tunicates

The juvenile stage of tunicates (marine invertebrates), which is free-swimming and undergoes metamorphosis into the adult form.