When a portion of a chromosome breaks off and attaches to a different

When a portion of a chromosome breaks off and

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When a portion of a chromosome breaks off and attaches to a different chromosome this is called a ____________Why does the possibility of Down syndrome increase as the mother’s age increases?What makes up a tetrad?Describe what happens during crossing-over.The failure of sister chromatids to separate during meiosis is called __________What are the functions of meiosis?How does nondisjunction during meiosis I differ from nondisjunction in meiosis II?Crossing over between sister chromatids does not result in recombination of genetic material while crossing over between non-sister chromatids does because?What do spindle fibers do?In humans, what cells does meiosis occurs in?Synapsis occurs during which cellular division process?Homologous chromosomes are composed of what?                             
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A tumor suppressor gene undergoes a mutation that causes it to lose its normal function. What would most likely be the result of this mutation? Describe the steps of fertilization in the correct order.    
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