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ile Edit View History Bookmarks Tools Help MasteringGenetics Ps2 x https://session.masteringgeneticscom/myct/temview?assignmentproblel c a Search PCB3063 Genetics PS2 Non-disjunction previous l 1 of 2 l next Non-disjunction Part A A diseased diploid organism, with 13 chromosomes pairs, enters meiosis. Using microscopic techniques, a concludes that nondisjunction of 1 homologous pair occurs during Anaphase l. In these disease cells, a cleavage furrow to develop during Telophase ll half of the time. What is the maximum number of chromatids in one of the resulting daughter cells at the end of meiosis? Consider only 1 starting cell, and no crossing over. Ayob 54 MLAnswers Give Up Submit Incorrect, Try Again: 2 attempts remaining ContinueExplanation / Answer
Meiosis is a special kind of cell division used in the production of gametes. Here the diploid cell is converted into haploid cell. In meiosis, chromosome number is reduced by half and the number of daughter cells produced increases by four times. All daughter cells have half the number of chromosomes.
Here, in this question a diseased diploid organism with 13 chromosome pairs enters meiosis. Meiosis occurs in two stages: meiosis I and meiosis II. Homologous pairs seperate during meiosis I and sister chromatids seperate during meiosis II.
At the end of meiosis I, two daughter cells with haploid number of chromosomes are formed. The homologous chromosomes are separated during anaphase I stage. Since there is nondisjunction of 1 chromosome pair, two daughter cells one with 12 and the other with 14 chromatids are produced.
In meiosis II, sister chromatids seperate during anaphase II stage. Cleavage occurs during telophase stage producing daughter cells. Here, there is a defect in cleavage half of the time. So at the end of meiosis II, daughter cell with 12 chromatids produce 2 cells one containing 12 chromatids and the other with 24 chromatids. Similarly cell entering meiosis II with 14 chromatids produce 2 cells one cantaining 14 chromatids and the other containing 28 chromatids. Finally cell with 13 homologous pairs of chromosomes produce 4 daughter cells each containing 12, 24, 14 and 28 chromatids.
Hence the answer for this question is 28.
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