Higher Tier: fertility hormones and IVF
הוצג| English | משמעות |
|---|---|
| IVF/ˌaɪ viː ˈef/ | IVF |
| embryo transfer/ˈembrɪəʊ ˈtrænsfɜː/ | העברת עובר |
What would explain this observation?
- Higher Tier: Fertilisation in a laboratory is only one stage of IVF 体外受精. The sequence also requires maturing eggs, developing embryos and transfer to the uterus.
Build the model
- FSH and LH can be used as fertility drugs to stimulate egg maturation and release, after which pregnancy may occur through the usual route.
- In IVF these hormones stimulate maturation of several eggs.
- Eggs are collected and fertilised with sperm in a laboratory; fertilised eggs develop into embryos before transfer to the uterus.
- IVF: Fertilisation outside the body followed by embryo development and transfer.
- embryo transfer 胚胎移植: Placement of an embryo into the uterus during fertility treatment.
Which sequence fits IVF?
רמת קושי 1/5 · 100 מטבעות + בונוס קטן בהשלמה הראשונה היום
IVF fertilises the egg OUTSIDE the body: hormones first mature several eggs, the eggs are collected and fertilised in the laboratory, embryos develop, and one is transferred to the uterus. Transfer of an unfertilised egg is not IVF.
Match each technical term to its precise meaning.
רמת קושי 2/5 · 140 מטבעות + בונוס קטן בהשלמה הראשונה היום
Use the definitions to distinguish related quantities and processes.
Choose evidence that can test it
- The specification describes transfer of one or two tiny embryos.
- This is its teaching sequence, not a current clinical recommendation about embryo number.
- Treatment can be physically and emotionally stressful, success is uncertain and multiple births can carry risks to mother and babies.
- Evaluate benefits and risks using the stated evidence and perspectives rather than promise a guaranteed baby.
In the lab: Arrange an anonymized model IVF sequence and analyse fictional success data with a clearly defined outcome. Distinguish fertilisation, embryo transfer, pregnancy and live birth; rates for these outcomes are not interchangeable. Actual treatment is professionally supervised and does not become a school performance task or experiment on participants.
Which two habits make the investigation or model in this case more defensible?
רמת קושי 2/5 · 140 מטבעות + בונוס קטן בהשלמה הראשונה היום
Stating the conditions and assumptions lets others repeat the work exactly, and recording the supporting evidence lets them check the conclusion. Hiding disagreeing results removes the evidence that could challenge a wrong conclusion, and one measurement can never establish a wider claim.
Work from known quantities
- Known: a fictional dataset records 18 stated successful outcomes among 60 treatment cycles.
- Observed rate = 18/60×100 = 30%.
- This is a per-cycle rate for that definition, not a cumulative chance for a person after several cycles.
- Independence cannot be assumed without supporting information.
Your turn: A fictional dataset has 16 specified successes among 80 cycles. Calculate the rate.
A fictional dataset has 16 specified successes among 80 cycles. Calculate the rate.
רמת קושי 2/5 · 140 מטבעות + בונוס קטן בהשלמה הראשונה היום
The result is 20 %. Known: 16 successes among 80 cycles. Use rate = successes / cycles x 100. Rate = 16/80 x 100 = 20% per cycle. A cumulative chance over several cycles cannot be read from this single per-cycle rate.
Check the conclusion and its limits
- IVF does not place an unfertilised egg directly into the uterus as its final defining step.
- Fertilisation and implantation are different events.
- The course model must not be used to prescribe hormone doses or embryo numbers.
Not true: A per-cycle success percentage is automatically a person’s cumulative chance after repeated cycles. A per-cycle rate applies to each cycle; a person's cumulative chance over several cycles depends on whether cycles are independent and on changing circumstances. Multiplying the percentage by the number of cycles is not valid.
- FSH and LH can be used as fertility drugs to stimulate egg maturation and release, after which pregnancy may occur through the usual route.
- The specification describes transfer of one or two tiny embryos.
- Watch for: IVF does not place an unfertilised egg directly into the uterus as its final defining step.
A per-cycle success percentage is automatically a person’s cumulative chance after repeated cycles.
רמת קושי 1/5 · 100 מטבעות + בונוס קטן בהשלמה הראשונה היום
A per-cycle rate applies to each cycle; a person's cumulative chance over several cycles depends on whether cycles are independent and on changing circumstances. Multiplying the percentage by the number of cycles is not valid.
Fertilisation outside the body followed by embryo development and transfer: write the technical term.
רמת קושי 1/5 · 100 מטבעות + בונוס קטן בהשלמה הראשונה היום
IVF means Fertilisation outside the body followed by embryo development and transfer.