Diagram of a sex cell

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Diagram of the male sex cells - sperm. Royalty-Free Vector. Download preview.

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In humans, male sex cells or spermatozoa sperm cellsare relatively motile. Female sex cells, called ova or eggs, are non-motile and much larger in comparison to the male gamete. Male and female sex cells are dramatically different from one another in size and shape.

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Sperm cells are gametes sex cells that are produced in the testicular organ gonad of male human beings and animals. Like the female gamete Oocytesperm cells carry a total of 23 chromosomes that are a result of a process known as meiosis. In both animals and human beings, among many other organisms, these cells are involved in the sexual mode of reproduction which involves the interaction of male and female gametes.

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Sexual reproduction is a type of life cycle where generations alternate between cells with a single set of chromosomes haploid and cells with a double set of chromosomes diploid. Diploid cells divide into haploid cells in a process called meiosis. Two haploid cells combine into one diploid cell in a process called fertilisation. Between fertilisation and meiosis there can be multiple cell divisions without change of the number of chromosomes.

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The male and female reproductive gametes sperm and egg have specialised structures which reflect their functions. Video of an Unfertilised Human Egg. Adapted from a video published by the Frisco Institute for Reproductive Medicine.

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The flower is the reproductive organ of many plants. The table describes the main parts of a flower and their functions:. Flower structure Parts of a flower The flower is the reproductive organ of many plants.

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Human reproduction is any form of sexual reproduction resulting in human fertilization. It typically involves sexual intercourse between a man and a woman. During sexual intercourse, the interaction between the male and female reproductive systems results in fertilization of the woman's ovum by the man's sperm.

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Chromosomes are thread-like molecules that carry hereditary information for everything from height to eye color. They are made of protein and one molecule of DNA, which contains an organism's genetic instructions, passed down from parents. In humans, animals, and plants, most chromosomes are arranged in pairs within the nucleus of a cell. Humans have 22 of these chromosome pairs, called autosomes.

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The lower animals like protozoans, sponges and few coelenterates reproduce in one simple way while all the rest follow a different pattern of reproduction. Based on whether there is participation of one organism or two in the process of reproduction, there are two types of reproduction. When offspring is produced by a single parent with or without involvement of gamete formation, the type of reproduction is sexual. When two parents of opposite sex participate in the reproductive process and also involve fusion of male and female gametes, it is called sexual reproduction.

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