What actually determine the sex of a baby? Sperm or egg?

Answers:
Sperm. Forgive the simplistic explanation, but this is what I recall from science class. Human chromosomes are paired; women have XX and men have XY (for gender). The egg contributes one genger chromosome and the sperm contributes one. The woman only has Xs to give, so the actual determination of the baby's gender depends on whether the sperm that reaches the egg is carrying an X or a Y.

Other Answers:
sperm.egg determines the number of babies
Source(s):
nurse

SPERM

Sperm will give X or Y and egg will only give X.

XY - male
XX - female

What sex a baby will be is decided when the egg and sperm unite.

Each egg and each sperm have one sex chromosome.

There are two kinds of sex chromosomes X and Y. Can you see why they are called x and y chromosomes?

Eggs carry an X and sperm carry either an X or a Y

X+X means the cell will develop into a baby girl.
X+Y means that it will develop into a boy.

(see link to learn more)
Source(s):
http://www.cyh.com/HealthTopics/HealthTopicDetailsKids.aspx?p=335&np=289&id=1613

A sperm carries either an X or Y chromosome, while an egg only carries an X chromosome. When the two pair, the chromosome carried by the SPERM determines whether it is a boy or a girl.

XX - Girl
XY - Boy
Source(s):
Biology Class

sperm

its sperm,i heard now you can choose gender of your baby by filtering your husband sperm

sperm - little suckers swim real fast and the most determined one gets the prize.

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What actually determine the sex of a baby? Sperm or egg?

Pregnancy & Parenting