The birch root cell contains 18 chromosomes. 1) The diploid cell of the birch anther has undergone meiosis. The resulting microspores shared mitosis. How many cells formed? How many chromosomes are there in each of them? 2) Determine the number of chromosomes and the total number of chromatids in birch cells during meiotic division: a) in the equatorial plane of the cell in metaphase I; b) in metaphase II; c) at each pole of the cell at the end of anaphase I; d) at each pole of the cell at the end of anaphase II.
1) As a result of dividing the anther cell, 8 cells were formed with 9 chromosomes in each.
2) a) metaphase I – 2n4c = 18 chromosomes 36 chromatids b) metaphase II – 1n2c = 9 chromosomes 18 chromatids c) anaphase I – 1n2c = 9 chromosomes 18 chromatids d) anaphase II – 1n1c = 9 chromosomes 9 chromatids
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