developmental biology

The allantois ____________________.

• occurs in birds but not in mammals

• is an outgrowth of the amnion in all animals producing it

• contributes blood vessels to the umbilical cord in mammals

• becomes the placenta in mammals

In humans, organogenesis in the embryo is essentially complete by the end of which stage of the pregnancy?

• first trimester

• first month

• first week

• second trimester

Tags

NGSS.HS-LS1-4

In reptiles, birds, and mammals, mesoderm is formed by invagination and involution into the

• amnion

• gastrocoel

• primitive streak

• archenteron

Contact of the optic stalk with ectoderm induces the formation of the

• iris

• lens

• cornea

• retina

Ectodermal cells thicken into placodes that develop into

• peripheral nerves

• spinal column

• skeletal muscles

• sensory organs of the head

Tags

NGSS.HS-LS1-4

Ectoderm cells associated with anterior neural crest cells thicken and form

• blaastopore

• dorsal lip

• placodes

• primitive streak

Tags

NGSS.HS-LS1-4

The lining of the uterus in which the mammalian embryo implants itself is called the________

• yolk plug

• lanugo

• trophoblast

• endometrium

The cavity inside the blastula is called the

• gastrula

• blastula

• archenteron

• blastocoel

In humans, organogenesis in the embryo is essentially complete by the end of which stage of the pregnancy?

• first week

• first trimester

• second trimester

• third trimester

Tags

NGSS.HS-LS1-4

The trophoblast gives rise to the

• chorion

• amnion

• allantoise

• yolk sac