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18 Cards in this Set

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  • Back
What are the 5 steps of embryo development, beginning with the fertilized egg?
1. zygote
2. morula
3. blastula
4. gastrula
5. neurula
A transport form of yolk formed in the liver of the female and carried in her blood.
In the ovum, vitellogenin is transformed in to these, which consist of storage packets of nutrients the support the growing embryo.
yolk platelets
The amount of yolk in an egg is classified according to three types:
--little yolk
--medium yolk
--lots of yolk
What is the embryonic term for
--even distribution of yolk
--concentration of yolk at one end
A transparent jacket of fibrous protein surrounding the embryo
vitelline membrane
The secondary egg envelope contains these cells, that usually fall off in vertebrates. In placental mammals, they cling to the ovum and form the _____.
--follicle cells
--corona radiata
The shell of oviparous animals' eggs is part of the_________ and the shelled egg itself is called a _________ egg.
tertiary egg envelope, cleidoic
1. Act of laying eggs
2. Act of giving live birth

3. Term encompassing both egg-laying and live birth
1. oviposition
2. parturition

3. parition
1. Embryos that draw nutrition from the yolk of the ovum

2. Embryos that get nutrients from alternative sources
1. lecithotrophic

2. matrotrophic
Cleavage patterns:
1. mitotic furrows pass throuth the entire zygote
2. furrowing is slowed and only a portion of the cytoplasm is cleaved
3. the vegetal pole remains undivided
1. holoblastic
2. meroblastic
3. discoidal
Methods of cell movement:
1. spread across outer surface as a unit
2. turn inward and spread on internal surface
2. indent and fold inward
3. split into parallel layers
4. individual cell migration from the surface to interior of the embryo
1. epiboly
2. involution
3. invagination
4. delamination
5. ingression
The formation of the gut and the space enclosed within it are called:
gastrulation, gastrocoel (archenteron)
Neurulation is the process of forming the _______ from the ectoderm, which eventually forms the central nervous system and encloses the _______.
neural tube, neurocoel
Departure from normal organ formation sequence is called:
Altered ontogeny in which:
--adults resemble juveniles
--adult forms are exaggeration of ancestral morphology
extention of the gut cavity for contatining waste, fuses with the chorion later in develop
allantoic membrane
Animals that:
1. exhibit true viviparity
2. develop inside the mother, but receive no nourishment
1. euviviparous
2. ovoviviparous