100% satisfaction guarantee Immediately available after payment Both online and in PDF No strings attached
logo-home
Summary Inheritance A level Biology £2.99   Add to cart

Summary

Summary Inheritance A level Biology

 2 views  0 purchase

Year 1 Biology AQA A level notes. Achieved an A* in my final exam using these notes. They are based on the mark scheme requirements.

Preview 1 out of 1  pages

  • November 2, 2024
  • 1
  • 2024/2025
  • Summary
All documents for this subject (131)
avatar-seller
arabellasherratt
Inheritance part 2 summary notes
21 February 2023 16:55



- Final pair of chromosomes are sex chromosomes
- Females have 2 X chromosomes
- Males have one X and one Y chromosome

Sex inheritance in humans
- All gametes in females are the same as they contain a single X chromosome
- Males produce 2 different types of gamete- half have X chromosome, other half have Y
chromosome


Sex linkage
- Any gene carried on X or Y chromosome is said to be sex linked
- X chromosome longer than Y chromosome- for most of the length of the X chromosom
there is no equivalent homologous portion of the Y chromosome
- Characteristics controlled by recessive alleles that are on the non homologous portion
the X chromosome appear more frequently in males as there is no homologous portio
on the Y chromosome that might have the dominant allele

Example: haemophilia - blood clots slowly- slow and persistent bleeding
- Mostly in males
- Usually a recessive allele with an altered sequence of DNA bases- codes for a faulty
protein that does not function
- Cannot produce functional protein that is required in clotting process

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 arabellasherratt. Stuvia facilitates payment to the seller.

Will I be stuck with a subscription?

No, you only buy these notes for £2.99. You're not tied to anything after your purchase.

Can Stuvia be trusted?

4.6 stars on Google & Trustpilot (+1000 reviews)

82191 documents were sold in the last 30 days

Founded in 2010, the go-to place to buy revision notes and other study material for 14 years now

Start selling
£2.99
  • (0)
  Add to cart