Development of sexual organs


Their roots and shoots elongate by virtue of the cells in their meristems, the conical growth buds at the tip of each branch. Regionalization falls rather into the type of process for which field theories have been invoked. Sex differences may be induced by specific genes , by hormones , by anatomy , or by social learning. In fact, any aspect of cell metabolism may be basically oscillatory in character; the cycle of cell growth and division may be only one example of a much more widespread phenomenon. Almost all adult males produce thousands of spermatozoa a. Each time a guy ejaculates, it can contain up to million sperm. For example, you might say that a man and woman can make a baby and that the baby grows inside the woman's belly. After a two-week period of rapid cell division known as the germinal period of development, the zygote forms an embryo. GAH-meetz , are involved.
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Female Reproductive System

His term "survival of the fittest" means the ability of a baby to survive and later produce the most offspring. At this stage, kids tend to be curious not only about their own bodies, but about others' too. There is a marked difference between the general system of development in multicellular plants and multicellular animals. One of them is always a X sex chromosome. Pathways, molecular interactions and genetic disorders". This topic continues in the next essay with a description of pre-natal human development from a three-week old fetus to a newborn. And do they realize that some of those jokes can hurt people?
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Biological development

By using this site, you agree to the Terms of Use and Privacy Policy. Facts matter and Britannica Insights makes it easier to find them. Such regressive changes are a part of the normal life history of certain organisms. The urethra is the channel that carries the semen to the outside of the body through the penis. This article includes a list of references , related reading or external links , but its sources remain unclear because it lacks inline citations. If you've previously said that a man and woman make a baby, now your child might want to know how. Tissues in the penis fill with blood and it becomes stiff and erect an erection. Medical researchers once speculated If the woman has taken emergency contraception a. Does ISNA advocate doing nothing when a child is born with intersex?
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Description:Sex differences range greatly and include physiologically differentiating. Atom, smallest unit into which matter can be divided without the release of electrically charged particles. Learn More in these related Britannica articles: Although in practice the physical and chemical processes of development normally proceed in close connection, for purposes of discussion it is often convenient to make an artificial separation between them. The life cycle of land plants involves alternation of generations between a sporophyte and a haploid gametophyte. Biological development encompasses , therefore, all the processes concerned with implementing the instructions contained in the DNA. This would be a period of simple growth. Click To View Large Image.

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