Question

At which stage is DNA microinjected into the fertilized egg ?

a) after the fusion of the male and female pronucleus

b) before the fusion of the male and female pronucleus

c) at the time of fusion of the male and female pronucleus

d) anytime before or after the fusion of male and female pronucleus​

Answer 1

Answer:

b) before the fusion of the male and female pronucleus.

Explanation:

Injection is done at the stage of development when the zygote has two pronuclei, one from each gamete, which will later fuse to form the diploid nucleus.

Hope it helps ✌✌

Answer 2

Answer:

a) after the fusion of the male and female pronucleus

Explanation:

In microinjection, a transgenic DNA construct is physically microinjected into the pronucleus of a fertilized egg.

The injected DNA can integrate into chromosomes in the injected pronucleus during chromosome replication. 

Hence, option a is the answer