Under What Circumstances Might Identical Twins Be Conjoined

question 59

Multiple Choice

Under what circumstances might identical twins be conjoined?

• A) If there is some mutation in the genetics of the mother.
• B) If there is some mutation in the genetics of the father.
• C) If two sperm fertilize the same egg.
• D) If the egg splits in two very early after fertilization (within five days).
• E) If the egg splits relatively late after fertilization (after nine days).

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Definitions:

Sympathetic Nervous System

Part of the autonomic nervous system that prepares the body for physical activity by triggering the "fight or flight" response.

Salivation

The involuntary production of saliva in the mouth, which can be stimulated by the anticipation of food or the presence of something to chew.

Amygdala

A part of the brain involved in emotion regulation, especially fear and pleasure responses.

Fear Response

An immediate alarm reaction triggered by the perception of imminent danger, real or perceived, characterized by physiological changes such as increased heart rate and adrenaline surge.