<P> Sexual reproduction is a form of reproduction where two gametes fuse together . Each gamete contains half the number of chromosomes of normal cells . They are created by a specialized type of cell division , which only occurs in eukaryotic cells , known as meiosis . The two gametes fuse during fertilization to produce DNA replication and the creation of a single - celled zygote which includes genetic material from both gametes . In a process called genetic recombination , genetic material ( DNA ) joins up so that homologous chromosome sequences are aligned with each other , and this is followed by exchange of genetic information . Two rounds of cell division then produce four daughter cells with half the number of chromosomes from each original parent cell , and the same number of chromosomes as both parents . For instance , in human reproduction each human cell contains 46 chromosomes in 23 pairs . Meiosis in the parents ' gonads produce gamete cells which only contain 23 chromosomes each . When the gametes are combined via sexual intercourse to form a fertilized egg , the resulting child will have 23 chromosomes from each parent genetically recombined into 23 chromosome pairs or 46 total . </P>
<P> Sexual reproduction is a form of reproduction where two gametes fuse together . Each gamete contains half the number of chromosomes of normal cells . They are created by a specialized type of cell division , which only occurs in eukaryotic cells , known as meiosis . The two gametes fuse during fertilization to produce DNA replication and the creation of a single - celled zygote which includes genetic material from both gametes . In a process called genetic recombination , genetic material ( DNA ) joins up so that homologous chromosome sequences are aligned with each other , and this is followed by exchange of genetic information . Two rounds of cell division then produce four daughter cells with half the number of chromosomes from each original parent cell , and the same number of chromosomes as both parents . For instance , in human reproduction each human cell contains 46 chromosomes in 23 pairs . Meiosis in the parents ' gonads produce gamete cells which only contain 23 chromosomes each . When the gametes are combined via sexual intercourse to form a fertilized egg , the resulting child will have 23 chromosomes from each parent genetically recombined into 23 chromosome pairs or 46 total . </P>
name the single cell from where life begins in all sexually reproducing organisms
name the single cell from where life begins in all sexually reproducing organisms
zygote
zygote