See how a human embryo develops the key characteristics that make it male or female. This feature originally appeared on the site for the NOVA program Sex: Unknown. Related Links. Life's Greatest Miracle Trace human development from embryo to newborn through the stunning microimagery of photographer Lennart Nilsson.
http://www.pbs.org/wgbh/nova/body/how-sex-determined.html
At conception, the babies sex is determined by chromosome characteristics -. The genetic sex of a child is established at conception based on the 23rd pair of chromosomes it inherits from the parent. The mother's egg contains an X chromosome, and the father's sperm will contain either an X or Y chromosome.
http://www.baby2see.com/gender/
We assign a newborn’s sex as either male or female*, based on their genitals. Once a sex is assigned, we presume the child’s gender. Someone born with a penis will be a boy and someone with a vulva will be a girl. For many people, this is cause for little, if any, concern or further thought.
https://www.genderspectrum.org/quick-links/understanding-gender/
At conception, gender is determined by chromosome characteristics - and it will be the male. (or rather the male's sperm) that dictates whether the baby will be a boy or a girl. Prior to conception, the unfertilized egg carries an X chromosome while the sperm can carry either an X or a Y chromosome.
http://www.baby2see.com/gender/
Almost everyone has around a 50% chance of having a boy and a 50% chance of having a girl. What we can say is that dad's sperm determines whether a baby will be a boy or a girl. About half of his sperm will make a boy and half a girl. The sex of the baby depends on which sperm gets to the egg first. In a perfect world, it would all be up to chance.
http://genetics.thetech.org/ask-a-geneticist/which-parent-decides-whether-baby-will-be-boy-or-girl
Genetics is rarely all or nothing. In almost every case your version of a gene will give you an increased or a lowered chance of a particular outcome (like becoming obese) but that outcome is not certain. Your other genes and environmental influences, such as how much you eat and exercise, all work together to determine how you end up.
https://www.theguardian.com/science/2008/apr/27/genetics.cancer
Genes alone cannot account for what a person is, but even the slightest distinguishing traits between people can be attributed to individual genes. What DNA can tell us. Genes alone cannot account for what a person is, but even the slightest distinguishing traits between people can be attributed to individual genes.
https://www.theguardian.com/science/2008/apr/27/genetics.cancer
Concept 9 Specialized chromosomes determine gender. People had long philosophized about the observed differences between males and females of a species. If one considers sex a trait, or set of traits, then it followed that sex is inherited. In 1905, closer study of meiosis revealed the chromosomal basis of gender. Scientists noticed an oddball pair among the homologous chromosomes lined up at the cell equator during reduction division.
http://dnaftb.org/9/
A transgender person has a gender identity that does not match the sex they were assigned at birth. So, a child who was assigned male on their birth certificate and who identifies as a girl is transgender (sometimes this term is shortened to “trans”).
https://www.genderspectrum.org/quick-links/understanding-gender/
How Is Sex Determined? The sex of an egg cell is set as soon as it is fertilized, but what happens to that cell and the cells it divides into to make a baby boy or a baby girl? In this step-thru, see how gonads—which look identical in early-stage embryos—become either testes or ovaries.
http://www.pbs.org/wgbh/nova/body/how-sex-determined.html
what determines your gender?
Gender is determined by a penis and a vulva. Someone born with a penis will be a boy and someone with a vulva will be a girl.