AP Biology 2005-2006 Fertilization. AP Biology 2005-2006 Fertilization Joining of sperm & egg ...

AP Biology 2005-2006

Fertilization

Fertilization Joining of sperm & egg

sperm head enters egg

Cleavage Repeated mitotic divisions of zygote

1st step to becoming multicellular unequal divisions establishes body plan

different cells receive different portions of egg cytoplasm & therefore different regulatory signals

Cleavage zygote morula blastula

establishes future development

OrganogenesisUmbilical blood vessels

Chorion

Amnion

Yolksac

AllantoisFetal blood vessels

Maternal blood vessels

Bird embryo

Mammalian embryo

Placenta

Placenta Materials exchange across membranes

Human fetal development

7 weeks4 weeks

Sex determination

TestesY

Sperm Zygote

Zygote

Indifferentgonads

No SRYOvaries

(Follicles do notdevelop until

third trimester)

Seminiferoustubules

Develop inearly

embryo

Leydig cells

Human fetal development10 weeks

Human fetal development

12 weeks 20 weeks

Human fetal development The fetus just spends much of the 2nd & 3rd

trimesters just growing …and doing various flip-turns & kicks inside amniotic fluid

Week 20

Human fetal development24 weeks (6 months; 2nd trimester)

fetus is covered with fine, downy hair called lanugo. Its skin is protected by a waxy material called vernix

Human fetal development30 weeks (7.5 months)

umbilical cord

Getting crowded in there!!32 weeks (8 months)

The fetus sleeps 90-95% of the day & sometimes experiences REM sleep, an indication of dreaming

Hormone induction

positive feedback

Intestine

Placenta

Umbilicalcord

Wall ofuterus

VaginaCervix

Birth (after 36 weeks)

Bladder

The end of the journey!

AP Biology 2005-2006 Fertilization. AP Biology 2005-2006 Fertilization Joining of sperm & egg ...

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Transcript of AP Biology 2005-2006 Fertilization. AP Biology 2005-2006 Fertilization Joining of sperm & egg ...

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