The bodies of most animals and plants contain body cells, eg skin cells, nerve cells, liver cells etc and ____ (sex cells). The body cells of most animals and plants each contain ____ sets of ____ in their ____. Every chromosome in one set has a matching partner in the other set that has the same length of ____ and the same ____. Cells that contain two sets of chromosomes are said to be ____. In sexual reproduction new organisms are produced from the ____ of the nucleus of a male sex cell with the nucleus of a female sex cell. This is called ____ . Sex cells are also known as ____. Male gametes are made by male reproductive structures. Female gametes are made by female reproductive structures. A gamete contains a ____ set of chromosomes in its nucleus and is said to be ____. The male gamete is the ____ cell. Sperm are continuously produced in the ____ of adult male mammals. During sexual intercourse sperm cells travel through the sperm ____, into the ____ and are released out of the end of the ____. The female gamete is the ____ cell. Egg cells are produced in the ____ of the female mammal. Eggs are released from the ovaries into the ____. If an egg is ____ by a ____ in the oviduct then it ____ a number of times then ____ into the wall of the uterus where it grows and develops into a new individual. Sperm cells reach the oviducts by swimming up through the ____ and the ____. ____ is the fusing of the nucleus of the haploid male gamete to the nucleus of the haploid female gamete to create the first cell of the new individual. This cell is ____ and is called a ____. The zygote will normally be a diploid cell because it receives ____ set of chromosomes from the female gamete and one set of chromosomes from the male gamete.

2.3 Reproduction

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