mammals
lizards
fowls
earwigs
B. lizards
centrolecithal
microlecithal
mesolecithal
telolecithal
the spermatids differentiate into spermatozoa
primary spermatcyte is tarnsformed into a secondary spermatocyte
spermatogonea complete multiplication phase
secondary spermatocyte extrudes polar bodies
holoblastic
meroblastic
diploblastic
triploblastic
Frog
Housefly
Hydra
Mosquito
primary oocyte
secodnary oocyte
ootid
gonocyte
copulation
amphimixis
syngamy
amplexus
vitellogenesis
oogenesis
spermatogenesis
fertilization
Spider
Crow
Honeybee
Earthworm
epiboly
emboly
both and
delamination
foregut
midgut
hindgut
somatopleure
4-5 years
6-8 years
8 - 10 years
12 -14 years
direct ontogenic development
indirect ontogenic development
chordates
embryogenesis in mammals
disappearance of tail
food habit becoming carnivore
land habit
excretion beocmes mesonephric
3
8
4
12
zygote of frog
brain of rabbit
eye of frog
retina of cockroach
Vasa efferentia, Bidder's canal, uriniferous tubule and nephrotome
Vasa efferentia, Bidder's canal, and uriniferous tubule
Vasa efferentia, uriniferous tubule nd Bidder's canal.
Vasa deferentia, uriniferous tubule and Bidder's canal
mammals
lizards
fowls
earwigs
birds
mammals
insects
molluscs
primary oocyte stage
secondary oocyte stage
ootid stage
matured ova stage
sperms of same species are essential
sperms do not need penetration
sperms of any animal can fertilize
only presence of male is sufficient
ova
sperm
both and
primary spermatogonia
hyaluronidase
hyaluronic acid
androgamone
cryanogamone
parthenogenesis
parthenocarpy
polyembryony
paedogenesis
spermiation
spermiogenesis
spermatogenesis
androgenesis
early blastula
late blastula
early gastrula
lategastrula
die immediately
start dividing
will remain undivided
transform into a tadpole at a faster rate
flagellum
acrosome
sperm lysins released from the acrosome
mitochondira located at the middle piece
fertilized egg
spermatozoa
unfertilized egg
egg membranes
ectoderm
meso derm
somatic mesoderm and endoderm
splanchnic mesoderm and ectoderm
enlarges in size
decreases in size
retains the same size at the beginning
gradually enlarges in size