Summary
Summary of IB Biology Topic 10 (Genetics and Evolution)
- Course
- Institution
- Book
Summary of IB Biology Topic 10 (Genetics and Evolution)
[Show more]
Connected book
Book Title:
Author(s):
- Edition:
- ISBN:
- Edition:
More summaries for
-
All the information for topic 5 IB Biology SL
-
All the information for topic 4 IB Biology SL
-
Information for topic 3 IB Biology SL
Seller
Follow
bellakim
Content preview
Topic 10 - Genetics HL10.1 - Meiosis
10.1.1 - Interphase
Interphase: period (before meiosis) where cell prepares for meiosis
S phase: chromosomes are replicated (forming sister chromatids)
Sister chromatids: genetically identical strands (same color)
Held together by centromere
S phase is the reason for two divisions in meiosis:
• Suggests meiosis evolved from mitosis
• Bene t: more potential for variation
10.1.4 - Chiasmata - IS ANY OF THIS NEW??
Synapsis: process whereby homologous chromosomes connect to form a bivalent (prophase I)
Connected by the synaptonemal complex (protein-RNA complex)
Sex chromosomes often remain unpaired.
Chiasmata: points of exchange (crossing over) between non-sister chromatids that hold the
bivalent together
fi
, 10.2 - Inheritance
10.2.1 - Dihybrid Crosses
Law of independent assortment (alleles are inherited independently) only applies to unlinked
genes.
Dihybrid cross: cross between two individuals homozygous for two speci c genes
Modeled using punnet squares.
Result in up to four di erent gamete combinations.
P generation: parent genotypes
Phenotypic ratio = 9 : 3 : 3 : 1
Example questions:
Pure breeding = homozygous
Pure breeding horned sheep with black wool: BBHH
Pure breeding hornless sheep with white wool: bbhh
a) F1: BbHh
ff fi
The benefits of buying summaries with Stuvia:
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
You can quickly pay through credit card or Stuvia-credit for the summaries. There is no membership needed.
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 bellakim. Stuvia facilitates payment to the seller.
Will I be stuck with a subscription?
No, you only buy these notes for $5.82. You're not tied to anything after your purchase.
Can Stuvia be trusted?
4.6 stars on Google & Trustpilot (+1000 reviews)
50990 documents were sold in the last 30 days
Founded in 2010, the go-to place to buy study notes for 15 years now