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25 Cards in this Set
- Front
- Back
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Leptotene stage
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chromatin material begins to condense
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Chromomeres
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localized condensations theat resemble beads on a string
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Zygotene stage
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chromosomes continue to shorten and thicken and begin to pair with each other
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Pachynema stage
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The homologs now synapsis and form tetrads
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Diplotene stage
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it is even more apparent that each tetrad consists of two pairs of sister chromatids
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Chiasma
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a point where the chromatids come together most likely to "cross over"
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Diakinesis
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the chromosomes pull farther apart but nonsister chromatids remain loosely associated via the chiasmata
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Terminalization
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a process where the chiasmata move toward the ends of the tetrad
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Independent assortment
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the random separation of dyads
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Disjunction
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The separation of chromosomes from one another
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Nondisjunction
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when separation is not achieved
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Spermatogenesis
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The formation of sperm
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Spermatogonium
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Undifferentiated diploid germ cell
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primary spermaocyte
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What spermatogonium enlarge to
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Secondary spermatocytes
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the products of the division of the primary spermaocyte
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spermatids
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haploid cells that come from the division of the secondary spermatocytes
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Spermiogenesis
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The series of developmental changes that spermatids go through
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Spermatozoa or Sperm
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The resulting cells from spermiogenesis
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OOgenesus
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the process of making eggs
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Ova
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the female eggs
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Secomdary Oocyte
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Recieves the majority of the cytoplasm from the primary oocyte-the other cell that recieves only a small amount of cytoplasm froms the first polar body
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OOtid
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differentiates into the mature ovum
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Sporophyte stage
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the diploid stage of plant cells
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gametophyte stage
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the haploid stage of plant cells
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Folded-fiber model
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Eric DuPraw- shoes how chromatin is condensed into a metaphase a metaphase chromosome
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