Reproductive strategies

1.Semelparity

2.Iteroparity

Semelparity - When organisms reproduce only once during their life

Ex- insects, other invertebrates, and occurs in organisms such as salmon, bamboo grasses, and agave plants

Iteroparity - When organisms reproduce multiple times during their life.

It is common in most vertebrates and perennial plants, such as trees

TLS Online TPP Program

#Id: 8916

#XL - T Zoology

Cytokinesis

With the exception of higher plants, the division of the cell is brought about by a contractile ring made of actin and myosin

TLS Online TPP Program

#Id: 8917

#XL - T Zoology

TLS Online TPP Program

#Id: 8918

#XL - T Zoology

Centralspindlin is a heterotetramer composed of two copies of the kinesin-6 motor protein MKLP1 and a dimer of a Rho GAP

TLS Online TPP Program

#Id: 8919

#XL - T Zoology

MKLP1 is inhibited by 14-3-3 to ensures that the spindle midzone microtubules do not compact until the end of anaphase

TLS Online TPP Program

#Id: 8920

#XL - T Zoology

During anaphase, when cyclin B-CDK1 activity is extinguished but Aurora and Polo kinases are still active, Aurora B phosphorylates MKLP1 and displaces the 14-3-3, allowing compact the spindle midzone.

TLS Online TPP Program

#Id: 8921

#XL - T Zoology

At the same time, Plk1 phosphorylates the Rho-GAP component, to form an active Centralspindlin-Ect2 complex.