Ch29NotesSum11

Ch29NotesSum11 - 1 Ch 29 – Prenatal Development •...

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Unformatted text preview: 1 Ch. 29 – Prenatal Development • Prenatal development includes: – Fertilization (conception) – Embryological development = the first 8 weeks post-fertilization – Fetal development = from 9 weeks post- fertilization to birth Fig. 29-8b, p. 1102 Fig. 29-1a, p. 1089 Fertilization (conception) • = the fusion of two haploid gametes → one diploid zygote – 1. The spermatozoon • Is relatively small • Carries the paternal DNA to the secondary oocyte – 2. The secondary oocyte • Is relatively large (~ 2,000X bigger than the sperm) • Is in “suspended animation” in metaphase of meiosis II • Contains maternal DNA, organ- elles, and enough nutrients to main- tain the zygote for about a week • Usually occurs near the ampulla of the uterine tube 12-24 hours after ovulation – Sperm reach the ampulla in 30 minutes to 2 hours • Their journey may be aided by contractions of the uterus and uterine tube • Fewer than 1% of ejaculated sperm reach the secondary oocyte 2 Fig. 28-8b, p. 1051 Fertilization: more about sperm • Capacitation – Even when they are “mature” in the ductus deferens, sperm are not yet motile or capable of fertilization (due...
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Ch29NotesSum11 - 1 Ch 29 – Prenatal Development •...

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