Humans are capable of only one mode of reproduction, i.e. sexual reproduction. Haploid sex cells (gametes) are produced so that at fertilization a diploid zygote forms. This tutorial is an in-depth study guide regarding male and female reproductive physiology...
For human species to obviate extinction, reproductive mature adults should be producing viable offspring in order to continue the existence of the species and pass on genetic information from generation to generation. Read this tutorial to learn more about human reproduction and fertilization...
Seed plants are vascular plants. They differ from the other vascular plants in producing seeds that germinate into a new plant. Two major plant divisions are covered: the angiosperms and the gymnosperms. ..
Different pregnancy and birth control and contraception strategies are described. Read this tutorial to learn each of these strategies. ..
This tutorial looks at sex determination via the sex chromosomes, X and Y. Read it to get more info on X and Y chromosomes and the genetic traits inherited via these two...
Bryophytes are a plant group characterized by being nonvascular. They include the mosses, the liverworts, and the hornworts. These groups of plants require external water, usually in the form of dew or rain. Some bryophytes grow exclusively in dark, damp environments in order to provide moisture. Find out more about them here...