Because the chorionic villi are fetal in origin, chromosomal abnormalities may be detected when cells from the villi are grown and analyzed.

Write down 3 sonographic characteristics seen in a fetus with Trisomy 21.

A normal karyotype consists of ___________ chromosomes or _________ pairs of chromosomes.

Create a fictional character who is experiencing symptoms consistent with Obsessive-Compulsive Disorder (OCD). In your response: Describe your character’s obsessions (intrusive, unwanted thoughts) and compulsions (repetitive behaviors or mental acts). Clearly explain how these symptoms meet the criteria for OCD, including how they cause distress or interfere with daily functioning. Recommend one non-biological treatment (such as Psychodynamic, Exposure and Response Prevention, or Cognitive Behavioral Therapy) and explain how it would be applied to help your character. Your response must be 5–8 complete sentences and demonstrate a clear understanding of OCD.

Identify the molecular geometry for the molecule pictured below the table.  

Considering the electronegativity values indicated for each element, which covalent bond is the LEAST polar? C Cl F O N H 2.5 3.0 4.0 3.5 3.0 2.1  

The compound K3N is  

Jean Piaget proposed that children in the preoperational stage think differently from older children and adults. Create your own original example of a situation involving a 3–6 year old child that demonstrates a cognitive limitation typical of the preoperational stage (e.g., egocentrism, centration, animism, lack of conservation, irreversibility). In your response: Identify the specific characteristic of the preoperational stage being demonstrated. Briefly explain the stage. Clearly explain how your example illustrates this stage. Your example must be different from the classic “liquid in different cups” conservation task.

Extra Credit Question (3 points) Suppose a scientist measures the amount of DNA per cell of a particular diploid species at various stages of meiosis. She finds that the meiotic cells contain 3.7 pg, 7.3 pg or 14.6 pg of DNA per cell. Specify the amount of DNA per cell (3.7 pg, 7.3 pg or 14.6 pg) for cells in the following stage of the cell cycle:      Stage of the Cell Cycle Amount of DNA per cell    G2    After Cytokinesis of Meiosis II    Metaphase of Meiosis II

What is a hereditary collagen defect, resulting in brittle forming bones and fetal bone fractures?