Shanda Developed Normally the First Few Months of Life, but by 18

question 103

Multiple Choice

Shanda developed normally the first few months of life, but by 18 months she had slowed head growth and stereotyped hand movements. She became socially disengaged and lost language. Genetic testing revealed a mutation in the MECP2 gene. Shanda has

• A)autism.
• B)PDD-NOS.
• C)childhood disintegrative disorder.
• D)Rett syndrome.

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Definitions:

Brain

The central organ of the human nervous system, located in the skull, responsible for processing sensory information, regulating bodily functions, and enabling cognition and emotions.

Embryo

An early stage of development in multicellular organisms after fertilization and before the fetus stage in humans.

Conception

The union of a sperm cell and an ovum that occurs when the chromosomes of each of these cells combine to form 23 new pairs.

Infants

Young children from birth to one year of age, who are in the earliest stages of childhood development.