Sperm determine gender
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Related to in vitro fertilization: artificial insemination. They are fertilized with sperm in a laboratory procedure, and then the fertilized egg embryo is returned to the woman's uterus. IVF is one of several assisted reproductive techniques ART used to help infertile couples to conceive a child. If after one year of having sexual intercourse without the use of birth control a woman is unable to get pregnant, infertility is suspected. Some of the reasons for infertility are damaged or blocked fallopian tubes, hormonal imbalance, or endometriosis in the woman. In the man, low sperm count or poor quality sperm can cause infertility.
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Scientists detect gender in sperm: Technique could allow parents to choose children's sex
Boy or girl? It's in the father's genes -- ScienceDaily
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Sexual differentiation in humans
Sex , the sum of features by which members of species can be divided into two groups—male and female—that complement each other reproductively. Sex, sexuality , and reproduction are all closely woven into the fabric of living things. All relate to the propagation of the race and the survival of the species.
Chromosomes are long segments of genes that carry hereditary information. They are composed of DNA and proteins and are located within the nucleus of our cells. Chromosomes determine everything from hair color and eye color to sex.
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