explain the formation of zygote
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Answers
Explanation:
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.
Answer:
Gametes are formed by the process of meiosis and hence carry only one type of each chromosome.23 autosomes and either an X chromosome or a Y chromosome (23, X/Y). While oocyte can have only an X chromosome the sperm can carry either an X or a Y chromosome. Zygotes have two copies of all chromosomes. Sex chromosomes present can be either XX or XY (46, XX/XY). While an XX carrying zygote will form a female, an XY carrying zygote will give rise to a male.
Explanation: