What is the chance that a sperm carrying an X chromosome will be the first to fertilize the ovum?

50/50 xxxxx

100%...they all carry an X chromosome.

100 percent male sperm carry xx and xy so theyll always contain an X

hope that helped

50%.... there are 2 types of sperm... one with the x  and one without...  so... you have a 50% chance...  but it also depends on the male....  if he produces more with x... the chances increase... but if he produces more without it... the it will decrease... but the ratios are about the same...  boy or girl... 50%

It is 49.99%.

Although 50% of sperm and male and 50% female there is a slight imbalance in the numbers of fertilisations with a tiny skew towards the male sperm. This is thought to be because male sperm are very slightly lighter and therefore swim just a little faster.

It is roughly 50/50 - BUT:

Y-containing sperm swim *slightly* faster than X-sperm, because the Y chromosome is smaller than the X chromosome. So if the ovum is far up the uterine tract, then the odds are greater that a Y-sperm will fertilise it first.
This only skews the odds very slightly, however.

Theoretically it should be equal to an Y-chromosome-carrying sperm being the first to fertilise the ovum as many have suggested.

Nevertheless, this is contrary to facts of demography where observations of human populations have shown that  the natural sex ratio is approximately 105 males to 100 females at birth, which reflects a disproportion in how the natural probability is realised.

""Humans have a Fisherian sex ratio. In humans the secondary sex ratio is commonly assumed to be 105 boys to 100 girls (which sometimes is shortened to "a ratio of 105")."

Four stages, also theoretical, are supposed to affect the sex ratio, the first of which is what you have in mind.

"Types of sex ratio

The sex ratio varies according to the age profile of the population. It is generally divided into four:

primary sex ratio -- ratio at fertilisation
secondary sex ratio -- ratio at birth
tertiary sex ratio -- ratio in sexually active organisms
quaternary sex ratio -- ratio in post-reproductive organisms

Measuring these is a problem since there are no clear boundaries between them."

If we disregard the ratio of natural premature termination of an embryo or a fetus to be equal between the sexes (which the next poster rejects as unsicientific, so only for the sake of arguement), then the secondary ratio can be used to reflect the primary ratio.

The going secondary sex ratio being 105 (Y) to 100 (X), a primary sex ratio of the same value gives 100 / 205 = approx. 0.439.

If the assumption has any quantitative validity, then the chances that a sperm carrying an X chromosome to fertilize the ovum first would be close to 0.439. (If the probability of a premature termination of an XY carrier is greater than that of an XX carrier, then the actual probability would be somewhat less than 0.439.)

http://en.wikipedia.org/wiki/Gender_imbalance

A little bit less than fifty percent... it is a more likely that a sperm carrying a Y chromosome will fertilize the ovum because they are carrying a smaller chromosome (the X chromosome is huge, the Y is very small) and therefore have less weight to drag them down. It is not really known exactly what the percentage is, because male embryoes are more likely to be miscarried than female embryoes (sometimes even before a woman knows she is pregnant!). But, when it comes down to birth, like someone said, there are 105 males to 100 females; that we do know.

The other reason why the population of male to female is more even than that is because of war... after World War II and Vietnam, both the US and Europe were facing a deficit of men!

And NO, sperm do NOT carry both an XX or an XY, that answer is TOTALLY wrong.... the egg has that extra X chromosome that pairs off with either the X or the Y from the sperm.