Embryonic Development Quiz: Epiboly and Gastrulation

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What is the main purpose of a fate map in zebrafish research?

To study the deep cell movements during epiboly.

To track cell lineage mixing throughout gastrulation.

To identify cells giving rise to specific tissues at the blastoderm stage. (correct)

To determine the exact moment of germ ring formation.

What causes the flattening of the dome of blastoderm cells during early gastrulation?

Migration of germ rings to the animal pole.

Movement of yolk cells downward.

Expansion of the embryonic shield.

Intercalation of deep cells with surface cells. (correct)

What do germ rings and embryonic shields represent in the early gastrula of loach embryos?

Regions where cell fate is determined.

Structures involved in cellular differentiation.

Sites of rapid cell division.

Landmarks indicating specific developmental stages. (correct)

What is the significance of arrowheads in figures showing germ rings in embryos?

Identifying cells that give rise to specific tissues. Signup and view all the answers

How do deep cells contribute to the formation of embryonic shields in loach embryos?

By migrating outward and intercalating with surface cells. Signup and view all the answers

What is the cluster of cells in the blastocyst that will develop into the embryo?

Inner cell mass (ICM) Signup and view all the answers

Which proteins stabilize the compaction of the 8-cell embryo?

E-cadherin Signup and view all the answers

What enzymatic action is responsible for hatching the blastocyst from the zona pellucida?

Trypsin-like protease Signup and view all the answers

Which hormones prime the endometrium for implantation of the blastocyst?

Estrogen and Progesterone Signup and view all the answers

What does the trophoblast synthesize to aid in binding and implantation?

Heparan sulfate proteoglycan Signup and view all the answers

During the Mid-Blastula Transition in zebrafish, what significant event occurs?

Zygotic gene transcription begins Signup and view all the answers

Which of the following is true about the cleavage of a Zebrafish (Danio rerio)?

Takes place in the blastodisc Signup and view all the answers

What role does the yolk syncytial layer (YSL) play during Loach (Misgurnus anguillicaudatus) development?

Generates the fish organizer Signup and view all the answers

At what stage do morphological changes occur in Loach (Misgurnus anguillicaudatus)?

Late-blastula stage Signup and view all the answers

Which statement accurately describes the development of lungfish regarding meroblastic cleavage?

Lungfish exhibit holoblastic cleavage without a Mid-Blastula Transition Signup and view all the answers

What distinguishes Zebrafish (Danio rerio) development from that of Loach (Misgurnus anguillicaudatus)?

Zebrafish undergoes Mid-Blastula Transition Signup and view all the answers

What is the function of the primitive endoderm in mammals?

Regulating cell movement of the epiblast Signup and view all the answers

Which cells are in contact with the trophoblast in a mammalian embryo?

Parietal endoderm cells Signup and view all the answers

What is critical for positioning the primitive streak in mammals?

Anterior visceral endoderm (AVE) Signup and view all the answers

What governs the ciliary cells of the Node in a mammalian embryo?

Planar cell polarity (PCP) Signup and view all the answers

Which germ layers are formed during late gastrulation in mammals?

Mesoderm and endoderm Signup and view all the answers

What is the role of the Hox genes along the body axis in mammals?

Expressed from anterior of hindbrain to tail Signup and view all the answers

What does epiboly entail in early embryonic development?

Vegetal spreading of cellular components Signup and view all the answers

What is the main role of the embryonic shield during midgastrulation?

Establishing the dorsal-ventral axis Signup and view all the answers

Embryonic Development Quiz: Epiboly and Gastrulation

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