EMBRYOS: And How They Develop

Biologist Jenkins, who wrote of asexual reproduction in Animals Without Parents (KR, 1970), explains here the workings of DNA and RNA, genes, chromosomes and hormones in a survey of embryonic development from the simplest protozoans through hydras, worms, sea urchins, frogs, chickens and mammals. Human embryology gets a close look toward the end, with material on twins, RH, birth defects, and (more questionably) the effect of drugs on fetal development. All measurements are metric and there is an appended equivalency table. In all, serious and thorough at this level, but never obscure.