The testes are male reproductive organs that produce and store , which is the male gamete containing half of the DNA in somatic cells. The typically 28-day process of egg release from the ovaries and, if fertilization does not occur, release from the body, is known as the cycle. If two eggs are released and fertilized by two different sperm, then twins will occur. If a hormone operates by entering a cell's nucleus and altering the expression of its DNA, then it is classified as a/n hormone. Once sperm cells are mixed with seminal fluid to provide protection and nutrition, this mixture is known as . The bulbourethral and glands play an important role in providing additional fluids to semen production. The first phases of a new zygote's growth through mitosis occur in the . The germ layer will eventually develop into the skin and nervous system. A fetus growing in the uterus does not eat food or drink water. Instead, important nutrients, antibodies, and molecules pass from the mother through the . Make a list, or write a short paragraph, that explains the major stages of pregnancy after fertilization, through childbirth. Provide as much detail as possible.

sperm,menstrual, fraternal last one is Umbilical cord

Explanation:

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fertilization, pictured in figure 24.23a is the process in which gametes (an egg and sperm) fuse to form a zygote. the egg and sperm each contain one set of chromosomes. to ensure that the offspring has only one complete diploid set of chromosomes, only one sperm must fuse with one egg. in mammals, the egg is protected by a layer of extracellular matrix consisting mainly of glycoproteins called the zona pellucida. when a sperm binds to the zona pellucida, a series of biochemical events, called the acrosomal reactions, take place. in placental mammals, the acrosome contains digestive enzymes that initiate the degradation of the glycoprotein matrix protecting the egg and allowing the sperm plasma membrane to fuse with the egg plasma membrane, as illustrated in figure 24.23b. the fusion of these two membranes creates an opening through which the sperm nucleus is transferred into the ovum. the nuclear membranes of the egg and sperm break down and the two haploid genomes condense to form a diploid genome.

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