Centuries: 11th century - 12th century - 13th century
Decades: 1120s 1130s 1140s 1150s 1160s - 1170s - 1180s 1190s 1200s 1210s 1220s
Years: 1168 1169 1170 1171 1172 - 1173 - 1174 1175 1176 1177 1178
A zygote is the result of fertilization. That is, two haploid sex cells, a male sperm cell and a female ovum, merge into a single diploid ...
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