arauca Posted January 25, 2015 Report Share Posted January 25, 2015 the sperm after it penetrates the ovo , I asume the combination the DNA takes place in the nucleus of the ovo . My question is : does the fertilized cimponebt ( new Combined DNA ) starts th gastrulation in the nucleus in the egg or does it migrate into the cytoplasm to grow.Sorry if I have not exressed my self well > Quote Link to comment Share on other sites More sharing options...
CraigD Posted January 26, 2015 Report Share Posted January 26, 2015 Welcome to hypography, arauca! :) Please feel free to start a topic in the introductions forum to tell us something about yourself. the sperm after it penetrates the ovo , I asume the combination the DNA takes place in the nucleus of the ovo .During fertilization, the genomes from the sperm and from the ovum are each encased and separated from the ovum’s cytoplasm in special nucli called pronuclei. Hours after the sperm and ovum have fused the membranes of both pronuclei break down, and their genomes, called during this phase chromosomes, combine to create the child’s genome, assisted by complicated microtubule structures. My question is : does the fertilized cimponebt ( new Combined DNA ) starts th gastrulation in the nucleus in the egg or does it migrate into the cytoplasm to grow.Both the initial combining of sperm and egg chromosomes, and subsequent division and recombination of chromosomes during mitosis, occur after the nuclear nuclear envelopes have disintegrated. Chromosomes don’t migrate from their nuclei into the cytoplasm – the nucleus ceases to exist. There are many good online texts on this, among them the Wikipedia articles oocyte activation and mitosis. Quote Link to comment Share on other sites More sharing options...
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