Developement Flashcards

1
Q

Define development

A

Series of progressive changes in form and function that occur during organisms life cycle

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2
Q

When does development take pace?

A

Embryonic stage precedes birth, continues until death

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3
Q

What are the key stages of development?

A

fertilisation, cleavage, gastrulation, organogenesis, morphogenesis

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4
Q

How is amniote development specialised?

A

Adapted structures that allow for the movement of reproduction into dry environment, by shell and by uterus, membranes provide a life support system for further embryonic development

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5
Q

What are the embryos of amniotes surrounded by?

A

Amniotic fluid, surrounded by sac called amnion membrane

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6
Q

What extra embryonic membranes develop in the click?

A

Chorion, amnion, yolk sac and allantois

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7
Q

What is the chorion?

A

Completely surrounds the embryo and other extraembryonic membranes, located outside the embryo. with amnion it exchanges gases between embryo and surrounding air

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8
Q

What is the amnion?

A

Encloses embryo in protective, fluid filled amniotic cavity, prevents dehydration and cushions mechanical shock

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9
Q

What is the allantois?

A

Functions as a disposal sac for certain metabolic wastes produced by the embryo. The membrane of the allantois functions as respiratory organ with the chorion.

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10
Q

Where does fertilisation take place in mammals?

A

In oviduct

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11
Q

When does life become independent?

A

Once its fully formed

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