Which abnormal chromosomal situation is a cause of Down Syndrome? a. phenylalanine b. mosaicism c. fragile X syndrome d. translocation Can you explain your answer? What supports it?
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Step 1: Down Syndrome is caused by an extra copy of chromosome 21, resulting in a total of 47 chromosomes instead of the usual 46. Show more…
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What is the origin of Down syndrome? A. An excess of DNA ligase, causing abnormal DNA replication. B. A tandem duplication of DNA during meiotic cell division. C. A point mutation in the gene encoding a histone. D. A frameshift mutation during fetal development. E. Nondisjunction of parental chromosomes during meiosis
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An abnormality in which there is one more or one fewer than the normal number of chromosomes is called (a) a karyotype (b) a fragile site $(c)$ an aneuploidy $(d)$ trisomy $(e)$ a translocation.
An inherited disorder caused by a defective or absent enzyme is called (a) a karyotype (b) trisomy (c) a reciprocal translocation (d) an inborn error of metabolism (e) an aneuploidy.
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