100% satisfaction guarantee Immediately available after payment Both online and in PDF No strings attached
logo-home
Introduction to Genetics (BIOL0003) Notes - Basic Mendelism $8.63   Add to cart

Class notes

Introduction to Genetics (BIOL0003) Notes - Basic Mendelism

 9 views  0 purchase
  • Course
  • Institution

Explore the fundamental principles of genetics with these concise notes tailored for Year 1 students in the Introduction to Genetics (BIOL0003) module at University College London. This document focuses on the basic Mendelism chapter, covering essential concepts like basic Mendelism, Mendel's secon...

[Show more]

Preview 2 out of 5  pages

  • November 30, 2023
  • 5
  • 2020/2021
  • Class notes
  • Dr amanda cain
  • All classes
  • Unknown
avatar-seller
Basic Mendelism
Basic Mendelism
 23000 genes
 Charles Darwin – 1837
o Studied evolution
 Family tree
 Gregor Mendel
o Interested in inheritance
o Worked on the hermaphrodite pea flower
 Hermaphrodite = flower is both male and female
 Ovary – contains egg cells (female cells)
 Stigma – contains pollen (male cells)
 Can fertilise itself – egg and pollen from same flower can produce new flower
 Brush stigma over ovary – to produce new flower




o
 Mendel made crosses between them
st
o 1 experiment
 P1 – crossed Yellow X Green (parental generation)
 P1 = parental generation
 F1 – cross produced All Yellow (first filial generation)
 F1 = first filial generation = 1st son generation produced from parental cross
 F2 – ratio of 3 Yellow to 1 Green
 F2 = second filial generation
o Mendel’s interpretation of his 1st experiment
 P1 – YY x GG
 Make Y, or G, pollen and egg
 F1 – All YG = yellow colour
 Yellow is dominant to Green – hinds green effects
 F2 – ratio of 3 Yellow to 1 Green (phenotypes)
 1YY: 2YG: 1GG (genotypes)
 Genetical terminology
o Gamete
 Organism’s reproductive cells (sex cells)
 Female gametes – egg cells
 Male gametes – sperm / pollen
 Produced by meiosis
 Contains 1n number of chromosomes

, Basic Mendelism
o Zygote
 Normal body cells
 Produced in mitosis
 Gamete + gamete = zygote
 Contains 2n number of chromosomes
o Locus
 Position of a gene in the genome that codes for a particular characteristic
o Allele
 Different forms of a gene
o Dominant
 Variation of a gene that will be expressed in the phenotype if at least 1 copy is present
o Recessive
 Variation of a gene that will only be expressed in the phenotype if two copies are present
o Homozygote
 An individual having two identical alleles of a particular gene
o Heterozygote
 An individual having two different alleles of a particular gene
 Pedigrees – diagram showing the biological relationships between an organism and its ancestors




o
 Consanguineous marriage = mating between two people descended from the same ancestor
o E.g.
 Brachydactyly with three generation dominant pedigree





o Huntington’s disease = dominant
 Cannot skip generations

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 or Stuvia-credit 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 sujansathiendran. Stuvia facilitates payment to the seller.

Will I be stuck with a subscription?

No, you only buy these notes for $8.63. You're not tied to anything after your purchase.

Can Stuvia be trusted?

4.6 stars on Google & Trustpilot (+1000 reviews)

85443 documents were sold in the last 30 days

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

Start selling
$8.63
  • (0)
  Add to cart