Which of the following is the first step of mitosis?
A) Duplicated pairs of chromosomes line up along the center of the cell.
B) The DNA unwraps from the chromosome.
C) The DNA material on each chromosome "unzips."
D) The 46 chromosomes duplicate themselves.
C) The DNA material on each chromosome "unzips."
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In Huntington's disease, an area of the brain implicated is the
a. putamen. b. substantia nigra. c. parietal lobe. d. beta-amyloid.
Your twelve-year-old daughter, Polly, describes a new female classmate, Holly, as "different." Polly tells you that Holly is quite short, but has broad shoulders and a webbed neck
She also says that Holly is clumsy in gym class, slow in geometry, but okay in English. Of the following, which is most likely to be true? A) Holly has Trisomy X. B) Holly is an XXX female. C) Holly has Turner syndrome. D) Holly has Klinefelter syndrome.