What is the median?

#Question id: 7213

#Unit 5. Developmental Biology

Following statements are regarding to the early development of C.elegans (expression of PIE-1):

A. Segregation of PIE-1 determinant into the P1 blastomere at the 2-cell stage

B. The sperm centrosome activates the presence of the PAR-3/PAR-6 complex in the posterior of the egg

C. PIE-1 is degraded in the resulting anterior AB cell, it is preserved in the posterior P1 cell

D. PIE-1 is degraded in the resulting posterior P1 cell, it is preserved in the anterior AB cell

Which of the following combination is incorrect?

#Question id: 7214

#Unit 5. Developmental Biology

The anterior posterior compartment of each segment of drosophila is defined by wingless and engrailed genes. The following statements are given towards explaining their regulation:

A.cells secreting Hedgehog protein activate wingless expression in their neighbors, and the Wingless protein signal, which is received by the cells that secreted Hedgehog, serves to maintain hedgehog (hh) expression.

B.Engrailed protein also acts in an autocrine fashion, maintaining its own expression.

C.The cells expressing engrailed can bind wingless protein because they contain Frizzled, which is the Drosophila membrane receptor protein for Wingless.

D.Binding of Wingless to Frizzled activates the hedgehog signal transduction pathway, resulting in the continued expression of engrailed.

Which of the following option has all the incorrect statements?

#Question id: 7215

#Unit 5. Developmental Biology

Limb bud initiation could have either initiation factors genomes Listed below are some limb bud initiation (Column A), their lateral plate mesoderm (Column B).

#Question id: 7216

#Unit 5. Developmental Biology

Following statements are about Specification of cell fate by the Dorsal protein. Which of the following statement is correct?

#Question id: 7217

#Unit 5. Developmental Biology

Following statements regarding to the metamorphic changes of frog development.

A. The metamorphic changes are brought about by the secretion of the hormone thyroxine (T4) into the blood by the thyroid gland

B. the conversion of T4 into the more active hormone tri-iodothyronine (T3) by the target tissues

C. the degradation of T3 in the target tissues

D. by the deiodinases enzymes T3 converted into T4 in target tissues.

Which of the following options are correct?

#Question id: 7218

#Unit 5. Developmental Biology

Following statements are regarding to convergent extension of the dorsal mesoderm in xenopus.

A. For convergent extension the first force is a polarized cell cohesion wherein the involuted mesodermal cells intercalate and the second force is differential cell cohesion.

B. The intercalations of mesodermal cells, both mediolaterally and radially, are stabilized by the planar cell polarity (PCP) pathway that is initiated by Wnts independent of β-catenin signaling.

C. The intercalations of mesodermal cells, are stabilized by the planar cell polarity (PCP) pathway that is initiated by Wnts dependent of β-catenin signaling.

D. Another factor regulating convergent extension is calcium influx from environment.

E. Ca2+ is released from intracellular stores and is required for convergent extension.

Which of the following combination is correct?