11.4 Reproduction

IB Memes

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.

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.

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