These holoblastic cleavage planes pass all the way through isolecithal zygotes during the process of cytokinesis.
2.
In mammals, because the isolecithal cells have only a small amount of yolk, they require immediate implantation onto the uterine wall to receive nutrients.
3.
In the absence of a large concentration of yolk, four major cleavage types can be observed in isolecithal cells : radial holoblastic, spiral holoblastic, bilateral holoblastic, and rotational holoblastic cleavage.
4.
In the absence of a large concentration of yolk, four major cleavage types can be observed in isolecithal cells ( cells with a small even distribution of yolk ) or in mesolecithal cells ( moderate amount of yolk in a gradient ) "'bilateral "'holoblastic, "'radial "'holoblastic, "'rotational "'holoblastic, and "'spiral "'holoblastic, cleavage.
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