Katherine was attending school five blocks away from the world trade center on september 11, 2001. since that time, she continues to have disturbing nightmares about planes, avoids going close to tall buildings, and talks a lot about the scary things happening in her life. katherine may be suffering from:

Katherine may be suffering from Post-Traumatic Stress Disorder.

Explanation:

Post-Traumatic Stress Disorder (PTSD) may develop after a person has been trhough a traumatic event. Shile it is nomral to feel fear and shock during and shortly after the event, some people experience the same fear long after the event has happened. When the symptoms interfiere with the person's everyday life and his or her relationships, it can be said that the person suffers from PTSD.

PTSD is the feeling that one is in danger, even though it isn't real danger, the person feels stressed and frightened. Some of the symptoms are nightmares or bad dreams and flashbacks, the person may also experience avoidance symptoms, like staying away from the places that remind him or her of the experience. Katherine has experienced all of these symptoms, which is why she may have PTSD.

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the answer is "meiosis ii in the mother".

the procedure of meiosis includes two divisions of the hereditary material. the main division is known as the decrease division – or meiosis i – on the grounds that it lessens the quantity of chromosomes from 46 chromosomes or 2n to 23 chromosomes or (n depicts a solitary chromosome set). in people, the decrease division results in two sperm cells each with 23 chromosomes or an egg cell with 23 chromosomes and one disposed of polar body. the second division – or meiosis ii – is called equational division. the two sperm cells split again creating four sperm cells, each with 23 or n chromosomes. in oogenesis, the egg cell and polar body partition to shape the ovum and two extra polar bodies. along these lines, the posterity are guaranteed to get one portion of the chromosomes from the mother and one half from the dad.