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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?
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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.
What is investigatory process?
It is the process where you should first have a material/s or equipment and then the treatment or general procedure then the analysis of data, findings and result and discussions. Last is you should have the summary/conclusion/recommendation.
What happens first mitotic cell division in a testis or the process of fertilization?
the cell changes
What happens to the egg cell and sperm cell during the fertilization process?
They meet to form a zygote which is the first stage of maturity of a human. Hope this helps ;;; ;;;;;;;; ;;; ;;; ;;; ;;; ;;; ;;; ;;; ;;; ;;;;;;;;; ;;;;;;;;
Which happens first pollination or fertilation?
Pollination. Fertilization is what occurs after pollination.
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.
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.
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.
How do cells combine to have a baby?
Cells combine to create a baby through a process called fertilization. During sexual reproduction, a sperm cell from a male and an egg cell from a female join together in a process called fertilization. This forms a zygote, which is the first cell of a new organism. The zygote then undergoes cell division and development to eventually form a baby.
What happens first in the process of the Dust Bowl?
Prolonged droughth
What is reproduce and fertilization?
In sexual reproduction, two parents donate genes to their young, resulting in offspring with a mix of inherited genes. These genes are donated through a process called fertilization. There are two mechanisms by which fertilization can take place. The first is external (the eggs are fertilized outside of the body), and the second is internal (the eggs are fertilized within the female reproductive tract). While fertilization is necessary for organisms that reproduce sexually, individuals that reproduce asexually do so without the need for fertilization. These organisms produce genetically identical copies of themselves through the process of mitosis.
How do women get their period?
the first menstrual periods is the beginning of the reproductive period of women. this is the time when the first ovulation starts. periods is a cyclical process in which it starts by hormonal changes due to this hormonal changes the ovum is produced from the ovary then it travels to fallopian tube to uterus and it wait for sperm for fertilization during this stage the inner wall of the uterus is thickened to receive the fertilized egg. when the fertilization not happened then the inner thickened layer of the uterus is shed off with the ovum with some blood this is known as periods. this is the process of periods.
What happens during your first weeks of pregnancy?
You die
What process respiration happens first?
During respiration, oxygen that enters the stomata caused the chemical breakdown of glucose into carbon dioxide and water. This releases energy that plants need for their life activities.. respiration is the energy-releasing process.
