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25 Cards in this Set

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