This drawing depicts some of the key structures involved in the biological basis of heredity. After studying the image, identify the letter that labels a chromosome. 
Definitions:
Caregivers
Individuals who provide care to those who need assistance due to conditions like old age, sickness, disability, or vulnerability.
Phenylketonuria (PKU)
A genetic disorder characterized by the inability of the body to break down the amino acid phenylalanine, leading to harmful levels in the brain and subsequently cognitive impairment if not treated.
Genetically Transmitted
Refers to the process by which traits or conditions are passed from parents to offspring through their genes.
Dominant Trait
An inherited characteristic that appears in an offspring if it is contributed from a parent through a dominant allele.
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