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During which phase does crossing over occur in meiosis?

Aneuploid gametes, which have an abnormal number of chromosomes, are significant because: 

DNA replication occurs once before mitosis and twice during meiosis.

A cell biologist produces a karyotype of mouse somatic cells arrested in mitosis. She sees 40 chromosomes, which is completely normal for mice. Based on this information, what is the haploid number of chromosomes for mice?

When attempting resuscitation of a child with pulseless electrical activity, you should:

If an initial cardioversion attempt is unsuccessful in a 33-pound child, you should repeat the procedure using ___ joules:

Medications used to prevent an asthma attack include:

A normal respiratory rate in a child:

When preparing to intubate a small child, it is important to remember that:

You are providing high-flow oxygen to a 3-year-old boy with severe respiratory distress. When you reassess him, you note that he is pale and his respiratory rate has decreased from 30 breaths/min to 12 breaths/min. You should: