Unit 2 Flashcards
this is associated with a visible specialization of the cytoplasm called germplasm
gametogenesis
- production of mature sperm cells
- spermatogonia undergo rapid mitosis to produce more stem cells before puberty
- follicle stimulating hormone modifies spermatogonia division
Spermatogenesis
- late spermatids are produced with distinct regions
- sperm cells result after maturing of spermatids
- spermatogenesis takes 64 to 72 days
Spermiogenesis
spermiogenesis take _____ to ____ days
64 to 72
- the development of mature ova
- it happens during meiotic division
- it has long resting periods
Oogenesis
In meiosis, males produces ___ functional sperm while females produces ___ functional ovum and ___ polar bodies
four, one, three
they are tiny, motile and equipped with nutrients in seminal fluid
sperm
this is large, non-motile and has nutrient reserves to nourish the embryo until implantation
Egg
what are the structures of sperm
head, neck/midpiece, tail
- must allow sperm to travel long distances , using plenty of energy
flagella
this is the motor portion of sperm
axoneme
-upon release, mammalian sperm are able to move but do not yet have the capacity to bind an egg
sperm capacitation
- it stores all material for beginning of growth and development
- it conserves and acquires more cytoplasm as it matures
ovum
it contains glycoproteins essential for species and sperm binding
Vitelline envelope
this is beneath the cell membrane
cortex
this attract or activate the sperm
cortical granules
this is the extra coating made of extracellular matrix
zona pellucida
layer of cells that nurture the egg and the innermost layer is called corona radiata
cumulus
this is the innermost layer of cumulus
corona radiata
fusion of two gametes to create new individual, with a genome different from both parents
fertilization
what is the two major goals of fertilization?
- joining of genetic material to create new variations
- creation of new organism
4 major events of fertilization
- sperm and egg make contact and must recognize each other as the same species
- one sperm enters egg
- fusion of the genetic material
- activation of egg to begin development
two mechanisms evolved to address the external fertilization
- species-specific attraction of sperm
- species-specific sperm activation
sea urchins have ________ peptide in the egg jelly of the egg
resact