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

Info iconThis preview shows pages 1–3. Sign up to view the full content.

View Full Document Right Arrow Icon

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
This is the end of the preview. Sign up to access the rest of the document.

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...
View Full Document

This note was uploaded on 12/29/2011 for the course BIOLOGY 24011 taught by Professor Pan during the Fall '11 term at HCCS.

Page1 / 12

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

This preview shows document pages 1 - 3. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online