____ aka fertilisation occurs when a male sperm meets with a female egg (____). A female releases a ____ egg cell (the female reproductive cell) once a month from her ____. This is called ____. When a male and a female have ____, the male ejaculates ____ into the female’s ____. Semen contains ____ (the male reproductive cell). The sperm travels up the female reproductive system, traveling through the ____ and uterus and finally enters the ____. The egg secretes chemical signals to the sperm so it knows where it is. It is in the fallopian tube that a male sperm and a female egg meet. Only ____ sperm can penetrate a female egg, once it has, a chemical change occurs in the eggs ____ which prevents any further sperm from entering. Once the egg is ____, it is now called a ____. Fertilisation marks the beginning of ____. It occurs when an egg, or ovum, and sperm fuse together. This enables the total number of ____ in the resulting nucleus to be restored to 46 (____), as ____ chromosomes from the sperm and 23 chromosome from the egg join as a nucleus is formed within the egg. The resulting ____ thus has half of its ____ from the female and half from the male. Fertilisation occurs in the uterine tube. The resultant zygote then passes along the ____, dividing repeatedly to form a hollow ball of cells called a ____. The blastocyst continues to grow, the cells reproducing by ____ very rapidly. It reaches the uterus within ____ and consists of about 15 200 cells. It then buries itself into the lining of the ____. This is called ____. The developing embryo can then start to receive ____ for its growth and development from the blood vessels glands in the uterine lining.

Fertilization and Implantation

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