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Sex is determined by a pair of sex chromosomes. Males have XY chromosomes and females have XX chromosomes. In the fertilization stage where the sperm combines with the egg, the sex of the offspring depends on whether the sperm carries a X or Y chromosome. The ovum always carries a X chromosome because females only have X chromosomes. So, if the sperm carries the X chromosome, the offspring will have XX chromosome and becomes a girl. If it carries the Y, the baby becomes a boy. X (sperm) + X (egg) = XX (female) Y (sperm) + X (egg) = XY (male)
What else can I help you with?
How does a girl become a boy?
A girl cannot become a boy. You were born a girl/boy, that's it. You're that for life.
How do you become a boy if your a girl?
become a goth that likes boy stuff but secretlylove girl stuff
Why would a girl want to become a boy?
because sometimes a girl has the mind of a boy but the body of a girl.
What is a girl actor called?
Actor - Boy Actress- Girl However, the term 'Actor' has become acceptable for both boy and girl actors.
If a boy kisses a girl on her lips the girl can become pregnant?
yes she can but if you dont have sex the girl will not be pregnant.
Can manglik Cancer boy become a lifepartner of Libra girl?
No
What are social changes during puberty?
You become a bïtch if your a girl but if your a boy you become like cooler
Africa-what make a boy become a man and a girl a woman?
puperty
Can a girl become pregnant if a boy kisses her?
You need to have sex to get pregnant.
How can a 10 year old girl become a tom boy but at the same time a girly girl without wearing boy clothes?
hang out with boys, or wear baggy girl clothes
How a girl becomes girlfriend?
A girl will become a girlfriend if.... A boy asks out that girl, or a girl asks out that guy because they like each other and the are intertested in each other and there answer is yes then they become boyfriend and girlfriend!
In which OddParents episode does Timmy Turner become a girl?
The Boy Who Would Be Queen
