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4. Fill in the blanks with words from the list below. Some may be used more than once, and
some words may not be used at all.
____Fertilization_______ occurs when the male gamete (sperm cell) fuses with the female
gamete (the egg) to produce a _____zygote_____________. The __zygote___________
travels down the _fallopian tube____________ towards the _____uterus_________. Along
the way it divides multiple times and eventually becomes a blastocyst. The blastocyst
embeds itself in the lining of the uterus. This process is called __implantation___________
and the blastocyst is now called an ___embryo__________________. As the
____embryo____________ grows and becomes more complex, specialized cells and tissues
start to develop. It also starts to form most ___organs_______________. At the end of 8
weeks, it is now referred to as a ___fetus__________________.