100% satisfaction guarantee Immediately available after payment Both online and in PDF No strings attached
logo-home
Previously searched by you
Previously searched by you
logo
Summary IB Biology SL/HL hormones and reproduction processes notes £9.49
Add to cart
Quickly navigate to
Preview
  2.  
  3. St Clare’s International College, Oxford
  4.  
  5. Biology HL

Summary

Summary IB Biology SL/HL hormones and reproduction processes notes
 0 purchase

Notes on all hormones and reproductive processes in the syllabus for 6.6 and 11.4 in IB Biology - both SL and HL content, written as bullet point processes to easily follow for markschemes.

Preview 1 out of 2  pages

Document information

  • June 2, 2023
  • 2
  • 2022/2023
  • Summary

Subjects

Written for

All documents for this subject (5)

Seller

avatar-seller
ashleykwan

Content preview

Outline the levels of each of the hormones that control the menstrual cycle immediately before
ovulation. [3 marks]
− FSH is released to trigger the development of an immature follicle
− the follicle produces oestrogen, uterine walls thicken as a result
− peaking oestrogen levels at day 12 increase levels of LH
− ovulation occurs at day 14, at the peak of LH levels
Outline the process of in-vitro fertilisation (IVF). [6 marks]
− IVF can only be done on selected candidates of a specific weight, age ranges, and other
criteria (eg. infertility)
− natural menstrual cycle is stopped by regulating LH and FSH
− superovulation is the process of overstimulating the reproductive system, so that multiple
eggs mature at the same time
− eggs are harvested
− sperm are then mixed with the eggs, and this can be done using ICSI, where a single sperm is
directly injected into the egg
− if fertilisation is successful, embryos will develop
− embryos can then be implanted into the uterus
Discuss the ethical issues surrounding IVF. [6]
− IVF can be beneficial because this allows infertile couples to have children, in some
countries, it could also benefit others, such as same-sex couples
− embryos can be screened for genetic disorders before being implanted
− successful embryos that are not implanted can be used for stem cell research, beneficial for
scientific research, as embryos are otherwise difficult to access
− limited access to IVF raises questions regarding medical justice (access to all, based on
clinical need, not ability to pay)
− success rate is quite low
− by choosing which embryos are implanted, we are essentially given the power to choose
who lives and who doesn’t

Fertilisation [8 marks]

− Sperm is attracted to egg by chemotaxis produced by the secondary oocyte
− The sperm passes through the follicle cells and binds to the zona pellucida
− The acrosome reaction occurs when protease is released from the acrosome and digests a
pathway through the zona pellucida
− Cortical reaction is the membrane fusion of the sperm and oocyte, cortical granules release
their contents
− The acrosome and cortical reactions prevent polyspermy
− The enzymes harden the zona pellucida
− Sperm nucleus enters cell, completing the second meiotic division
− Sperm and ovum fuse to form zygote

Pregnancy [8 marks]

− after fertilisation the zygote undergoes repeated mitosis
− after 4-5 days a blastocyst is formed

The benefits of buying summaries with Stuvia:

Guaranteed quality through customer reviews

Guaranteed quality through customer reviews

Stuvia customers have reviewed more than 700,000 summaries. This how you know that you are buying the best documents.

Quick and easy check-out

Quick and easy check-out

You can quickly pay through credit card for the summaries. There is no membership needed.

Focus on what matters

Focus on what matters

Your fellow students write the study notes themselves, which is why the documents are always reliable and up-to-date. This ensures you quickly get to the core!

Frequently asked questions

What do I get when I buy this document?

You get a PDF, available immediately after your purchase. The purchased document is accessible anytime, anywhere and indefinitely through your profile.

Satisfaction guarantee: how does it work?

Our satisfaction guarantee ensures that you always find a study document that suits you well. You fill out a form, and our customer service team takes care of the rest.

Who am I buying these notes from?

Stuvia is a marketplace, so you are not buying this document from us, but from seller ashleykwan. Stuvia facilitates payment to the seller.

Will I be stuck with a subscription?

No, you only buy these notes for £9.49. You're not tied to anything after your purchase.

Can Stuvia be trusted?

4.6 stars on Google & Trustpilot (+1000 reviews)

71241 documents were sold in the last 30 days

Founded in 2010, the go-to place to buy revision notes and other study material for 15 years now

Start selling

Recently viewed by you

Summary ·

(0)

Samenvatting Grondslagen van de marketing H12 Prijsbeleid

Exam (elaborations) ·

(0)

URBS 310 Final UPDATED Exam Questions and CORRECT Answers

Package deal ·

(0)

ATI Lab Verified Exam Booklet |100% Verified PACKAGE DEAL|

Package deal ·

(0)

ALL WAXING EXAM PACKAGE DEAL 2023 QUESTIONS AND ANSWERS

Exam (elaborations) ·

(0)

ServSafe Manager Exam(80 Questions) test Answered correctly

Package deal ·

(0)

Bundle For CCRC Exam Questions with All Correct Answers

Case ·

(0)

NR_554 Week 4 Discussion, Social Visibility of Health Issue

Exam (elaborations) ·

(0)

CPO FDLE Exam Review (all questions with Errorless Answers)

Package deal ·

(0)

DECA EXAM PACKAGE DEAL WITH COMPLETE SOLUTIONS GRADED A+
£9.49
  • (0)
Add to cart
Added