How is zygote formed ?
Answers
Explanation:
Zygotic stage: The zygote is formed when the male gamete (sperm) and female gamete (egg) fuse. Blastocyst stage: The single-celled zygote begins to divide into a solid ball of cells. Then, it becomes a hollow ball of cells called a blastocyst, attaching to the lining of the mother's
Answer:
The earliest form of zygote shows pronuclei where haploid germ cells from the male and female fuse with each other, breaking down the nuclear membrane, but they do not merge. Hence, they are single nucleic cells at this point.
The first stage of mitotic division occurs where genetic information is exchanged and chromosomes are paired, resulting in DNA replication at the spindle apparatus of the equator brought about by – the spermatozoa (centrioles) and the oocyte contributing the mitochondria. Thus, the first new cell – the zygote, with a chromosomal makeup of 2n4c is formed due to the alignment of chromosomes from both the sets at the spindle.