11.4 Reproduction
IB Memes
Higher Level students Essential Biology 11.4 Reproduction (includes Core) (Click4Biology). Click here for Core content and presentation.
Here are the Pythons with their birth sketch:
Here is a cool image – a German woman agreed to give birth in an MRI scanner and this is the result. What fetal and maternal structures can you identify?
Moment of Birth captured in MRI scanner. Via NewScientist.
Eleanor Lutz’s brilliant animation shows development of an embryo and fetus. From the TableTop Whale Blog. Click to go to the source.
Man pees on pregnancy test, is positive for HCG. Click to find out why! (BoingBoing).
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HPD Link: Reproductive Health
– What is the cause of menstrual cramps? From the Global Library of Women’s Health
– Simple factsheet on menstrual cramps (dysmenorrhea)
– Cause of pre-eclampsia discovered (link to enzymes and inhibition), from The Guardian
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Lyrical Science: (don’t) Divide Even, based on The Script’s Break Even.
| The Eggs – (don’t) Divide Even |
| FSH hormone’s stimulating |
| Ovaries, preparing for ovulating |
| But from one follicle there’s only one cell releasing |
| Cos in meiosis, yeah they don’t divide even |
| Fourteen days til the follicle bursts |
| Meiosis one gotta be completed first |
| From one oogonia in germinal epithelium |
| You only get one egg cos they don’t divide even |
| What does a chromosome do when it’s gotta wait years for meiosis II? |
| Why does it make a polar bo-dy when the (menstrual) cycle starts at puberty? |
| It’s o-o-genesis (yeah) |
| It’s o-o-genesis |
| Meiosis gives polar bodies for a reason |
| Multiple pregnancy’s dangerous when you’re breeding |
| The mature ovum got more cytoplasm for feeding |
| Cos these oocytes , yeah they don’t divide even |
| What does a chromosome do when it’s gotta wait years for meiosis II? |
| Why does it make a polar bo-dy when the (menstrual) cycle starts at puberty? |
| It’s o-o-genesis (yeah) |
| It’s o-o-genesis |
| (What happens next when the ovum is leaving? |
| To the f’lopian tube where the sperm might be seekin?) |
| In meosis the cells didn’t divide the same |
| Ovulation occurred when LH hormone came |
| The corpus luteum’s what’s left that remains |
| Releasing progesterone for the endometrium to maintain…. |
| These polar bodies, they’re degenerating |
| And the egg ventures on after ovulating |
| If the embyro implants after fertilisation |
| Progesterone inhibits further menstruation (and ovulation – by negative feedback whoa-oa!) |
| What does a chromosome do when it’s gotta wait years for meiosis II? |
| Why does it make a polar bo-dy when the (menstrual) cycle starts at puberty? |
| It’s o-o-genesis (yeah) |
| It’s o-o-genesis |
| But from one follicle there’s only one cell releasing |
| Cos in meiosis, yeah they don’t divide even |
Here’s The Script’s original video:
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Key terms: oogenesis, spermatogenesis, testis, ovaries, interstitial, germinal epithelium, spermatozoa, sertoli, mitosis, growth, differentiation, LH, luteinizing, FSH, follicle, oestrogen, testosterone, HCG, oxytocin, progesterone, epididymis, seminal vesicle, prostate, gland, ovary, primary follicle, mature follicle, secondary oocyte, polar body, degeneration, meiosis, sperm, egg, gametes, fertilisation, penetration, acrosome, cortical reaction, zygote, blastocyst, embryo, fetus, birth, placenta, villi, villus, diffusion, amniotic, cervix.
i-Biology 
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