About This Book
The text traces how a new individual develops, beginning at the cellular level and moving through reproduction, fertilisation, and the earliest embryonic stages. It describes sperm and ovum structure, their maturation and union that restores the full chromosome complement, and the rapid cleavage divisions that form a morula and then a hollow stage. Later sections outline the initial formation of tissues and organs, ways the embryo is nourished, and the biological implications of parental trait mixing. Presentation mixes descriptive anatomy and developmental sequence with discussion of the underlying problems and evidence from observation and experiment.
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