Tag: CSIR NET Life Science Previous Year Questions and Solution on Morphogenesis and Organogenesis in Animals

What would be the effect of retinoic acid (RA) treatment on the ‘positional information’ of blastema cells present on the amputated newt limb? (1) RA will have no effect (2) […]

In tadpoles, if the tail is amputated it can regenerate. However, if the tail is amputated and then exposed to retinoic acid, it develops limbs instead of regenerating the tail. […]

Sonic hedgehog (Shh) specifies the anterior-posterior axis during limb development. Which one of the following statements regarding it is correct? (1) Shh secreting cells undergo apoptosis after performing its function. […]

Following figure shows the early interactions between the Apical Ectodermal Ridge (AER) and the limb bud mesenchyme. The red lines with block head indicate repression while the black lines indicate […]

The mechanisms specifying the three axes of a tetrapod limb are interrelated and coordinated. In case of chick limb development the following statements were made: A. In the positive feedback […]

During wing development in chick, if Apical Ectodermal Ridge (AER) is removed, the limb development ceases, on the other hand placing leg mesenchyme directly beneath the wing AER, distal hindlimb […]

In the context of the proximal-distal growth and differentiation of a tetrapod limb following experiments were visualized (A) If the apical ectodermal ridge (AER) is removed at any time during […]

A set of experiments that were carried out to demonstrate the effect of Apical Ectodermal Ridge (AER) of the chick limb bud on the underlying mesenchyme are enlisted below, along […]

The proximal distal growth and differentiation of the tetrapod limb bud are made possible by a series of interactions between the apical ectodermal ridge (AER) and limb bud mesenchyme directly […]

During vertebrate limb development, a specialized ectodermal structure, called Apical Ectodermal Ridge (AER), forms at the dorso-ventral ectodermal boundary at the distal tip of the developing limb bud. The following […]