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It is hard to say which step happens first in the process of human fertilization. The process leading up to it is usually slow. A man and a woman smile at each other. That is actually the first step. They get to know each other. The process goes on and on. A man grabs hold of a woman. Neither one has clothes on. He puts his penis in her vagina. Both push back and forth. Eventually, with them breathing hard, he ejaculates semen. Sperm work their way out from her vagina, through her uterus into her fallopian tubes. Meanwhile, her ovaries prepare an egg. It has a full set of chromosomes. It loses half of them. Unlike ordinarily cell division, only the nucleus divides. The egg cell ejects the nucleus called a polar body. The ovary ejects the egg. little cilia move the egg to the fallopian tubes. There it meets the sperm. The sperm breaks through the surface of the egg. The surface becomes hard so no more sperm will break through. The sperm swims through the egg until it reaches the nucleus. There it deposits its chromosomes. The chromosomes in the nucleus break apart and then reassemble. At that point the chromosomes of the new individual exist in the form the new person will have them the rest of his or her life.
Which step happened first?
What else can I help you with?
What 3 ways does sexual reproduction increase genetic varation?
The Crossing over during meiosis I between non-sister chromatids. The random orientations and separations of homologous chromosomes and sister chromatids during metaphase I, anaphase I and metaphase II, anaphase II. The random fusion of male and female gametes.
What does the embryo contain?
An embryo is a multicellular diploid eukaryote in its earliest stage of development , from the time of first cell division until birth, hatching, or germination . In humans, it is called an embryo until about eight weeks after fertilization
How does dry ice turn into gas?
the change from a solid to a gas (without changing into a liquid first) is known as sublimation "Sublimation is an endothermic change (requires energy from its surroundings). As dry ice sublimes, the cold carbon dioxide vapor causes water vapor in the air to condense and form clouds."
Where did the first scientific challenge take place?
In Europe during the Renaissance.
Who the first to use rockets during a war?
chinese, to propel flaming arrows
What happens first mitotic cell division in a testis or the process of fertilization?
the cell changes
What is a developing human known as during the first eight weeks after fertilization?
A developing human during the first eight weeks after fertilization is known as an embryo.
Which happens first pollination or fertilation?
Pollination. Fertilization is what occurs after pollination.
At what point during development can an embryo split, and how late in the process can this occur?
An embryo can split into two separate embryos during the early stages of development, typically within the first two weeks after fertilization. This process is known as twinning. In rare cases, splitting can occur later in development, up to around 13 days after fertilization.
What happened doing fertilize?
If your question is what happens during fertilization? the answer varies. If your are speaking about sexual reproduction then fertilization occurs when the sperm and egg combine. Basically the first sperm to get to the egg keeps it. The egg hardens to keep excess sperm from entering. (of course some errors can occur which will lead to defects, twins, triplets, etc.) There are many other phases to the reproduction process but fertilization is basically when the egg and sperm combine.
Is the process of fertilization painful?
No, fertilization itself is a biological process that occurs within the reproductive system and is not painful. It involves the fusion of a sperm and an egg to form a zygote, which is the first stage of a developing embryo.
How does the speed of male sperm compare to female sperm in the process of fertilization?
Male sperm typically swim faster than female sperm in the process of fertilization. This difference in speed can affect which sperm reaches and fertilizes the egg first.
Is it true the differentiation process begins with the very first cell division after the formation of the zygote?
Yes, during the first few cell divisions after fertilization, the cells start to differentiate into specialized cell types. This process sets the foundation for the development of different tissues and organs in the growing embryo.
Which pair of terms best describes the usual location for fertilization and the first stages of development?
The pair of terms that best describe this process are "fallopian tube" for the usual location for fertilization and "blastocyst" for the first stages of development.
What happens to the egg cell and sperm cell during the fertilization process?
During fertilization, the sperm cell fuses with the egg cell to form a zygote. The genetic material from both cells combines to form a unique set of chromosomes that will determine the characteristics of the new organism. The zygote then undergoes rapid cell division to form an embryo.
Which process takes first in the development of a human being?
The first process in the development of a human being is fertilization, where a sperm cell fertilizes an egg cell to form a zygote. This marks the beginning of a new individual and sets off a series of developmental processes leading to the formation of a complete human organism.
What is it when eggs and sperm join?
It's called, fertilization... I'm pretty sure its spelled correctly.
