Two biology questions from a newbie

[meyrevived]

Hello all! Here are a couple of questions that have been circling in my mind for a while now

Comments

[scarlet_ave]

Actually the race for the egg is not entirely accurate. New evidence suggests that it is actually the egg that "decides" (by means of excreting a chemical which allows the egg "shell" to be penetrated) which sperm will penetrate, so it's not just whoever gets there first. Also, not all sperm goes at onces. It's actually believed that sperm is sent in kind of "shifts" over a course of a few days until the sperm is gone or the egg is fertilized.

[meyrevived]

That's cool. And yet, how do they recreate that in a lab?