Cell development Flashcard

Front

What is the main function of the paraxial mesoderm during vertebrate development?

Back

Formation of somites

Answer explanation

The paraxial mesoderm primarily contributes to the formation of somites, which are blocks of mesoderm that give rise to vertebrae, muscles, and dermis. This is a crucial step in the organization of the developing embryo.

Front

During early gastrulation in birds, which structure forms first?

Back

Primitive streak

Answer explanation

During early gastrulation in birds, the primitive streak forms first, establishing the body axis and initiating the process of gastrulation, while structures like the neural tube, limb buds, and somites develop later.

Front

Which process involves the folding of the neural plate to form the neural tube?

Back

Neurulation

Answer explanation

Neurulation is the process where the neural plate folds to form the neural tube, which eventually develops into the central nervous system. This distinguishes it from gastrulation, limb bud formation, and somitogenesis.

Front

Which region of the mesoderm gives rise to the kidneys?

Back

Intermediate mesoderm

Answer explanation

The kidneys develop from the intermediate mesoderm, which is specifically responsible for forming the urogenital system, including the kidneys and gonads. The other mesodermal regions do not contribute to kidney formation.

Front

What is the initial outgrowth of the tetrapod limb called?

Back

Limb bud

Answer explanation

The initial outgrowth of the tetrapod limb is called the limb bud. It is a crucial structure in limb development, differentiating into various parts of the limb as the organism grows.

Front

Which structure is formed from the paraxial mesoderm during vertebrate development?

Back

Somites

Answer explanation

The paraxial mesoderm differentiates into somites during vertebrate development, which are crucial for the formation of the vertebral column and associated structures. Other options like heart, kidneys, and liver arise from different germ layers.

Front

Which stage of bird gastrulation involves the migration of cells through the primitive streak?

Back

Gastrulation

Answer explanation

Gastrulation is the stage where cells migrate through the primitive streak, forming the three germ layers. This process is crucial for proper embryonic development, distinguishing it from cleavage, neurulation, and somitogenesis.

Front

Which gene is NOT involved in Drosophila D-V patterning?

Back

Sonic hedgehog

Answer explanation

Sonic hedgehog is not involved in Drosophila D-V patterning. The genes Dorsal, Twist, and Decapentaplegic play crucial roles in establishing the dorsal-ventral axis in Drosophila development.

Front

Which process describes the formation of the three germ layers in birds and mammals?

Back

Gastrulation

Answer explanation

Gastrulation is the process that leads to the formation of the three germ layers: ectoderm, mesoderm, and endoderm, in birds and mammals. This is a crucial step in embryonic development.

Front

Which signaling center is essential for limb outgrowth in tetrapods?

Back

Apical ectodermal ridge (AER)

Answer explanation

The Apical ectodermal ridge (AER) is crucial for limb outgrowth in tetrapods as it produces signaling molecules that promote the growth and patterning of the limb bud, making it the essential signaling center for this process.