Examlex
In the karyotype of a person with Down syndrome, or trisomy 21, an extra copy of chromosome 21 is apparent. This abnormality affects roughly 1 of every 700 children born and is the most common serious birth defect in the United States. People affected by Down syndrome often have mental retardation and shortened life spans.
Based on this scenario and your understanding of meiosis, what is the most likely basis for the extra chromosome in people with Down syndrome?
Dopamine
A neurotransmitter involved in reward, pleasure, and motor function in the brain.
Attraction
The feeling of being drawn towards someone or something, often due to physical, emotional, or psychological factors.
Helen Fisher
An American anthropologist and human behavior researcher known for her work on romantic love, marriage, and the biology of attraction.
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