LIFESCI 7B Chapter Notes - Chapter N/A: Sister Chromatids, Nondisjunction, Karyotype
14 Feb 2019
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Nondisjunction can take place in mitosis, and it leads to cell lineages with extra or missing chromosomes which are often observed in cancer cells. http://www. macmillanhighered. com/brainhoney/resource/6716/digital_first_content/trunk/test/morri s2e/asset/img_ch15/morris2e_ch15_fig_15_10. jpg. Nondisjunction. (a) chromosomes separate evenly into gametes in normal meiotic cell division. (b) Down syndrome a condition resulting from the presence of an extra copy of chromosome 21; also known as trisomy 21. trisomy 21 a condition resulting from the presence of three, rather than two, copies of chromosome. 21; also known as down syndrome. karyotype a standard arrangement of chromosomes, showing the number and shapes of the chromosomes representative of a species. http://www. macmillanhighered. com/brainhoney/resource/6716/digital_first_content/trunk/test/morri s2e/asset/img_ch15/morris2e_ch15_fig_15_11. jpg. The presence of the y chromosome, not the number of x chromosomes, leads to male development. The female karyotype 47, xxx (47 chromosomes, including three xchromosomes) and the male karyotype 47, xyy (47 chromosomes, including one x and two ychromosomes) are found among healthy females and males.
