Biology HL
Biology HL
4
Chapters
553
Notes
Theme A - Unity & diversity
Theme A - Unity & diversity
Theme B - Form & Function
Theme B - Form & Function
Theme C - Interaction &  Interdependence
Theme C - Interaction & Interdependence
Theme D - Continuity & Change
Theme D - Continuity & Change
IB Resources
Theme D - Continuity & Change
Biology HL
Biology HL

Theme D - Continuity & Change

Unlock the Secrets of Human Genes!

Word Count Emoji
532 words
Reading Time Emoji
3 mins read
Updated at Emoji
Last edited on 5th Nov 2024

Table of content

Hey future biologists! 👋 Let's dive into the amazing world of human genes, their locations, and how all this connects to real-life stuff like diseases. Trust me, it's not as hard as it sounds! Let's break it down.

What are Loci? 📍

First things first, each gene in your body has a 'home address' on a chromosome. This address is called its locus (plural: loci). Imagine your neighborhood as a chromosome and each house as a gene; the street address of each house is its locus. Cool, huh?

 

🌟 Takeaway: Locus is the specific location of a gene on a chromosome.

Base Sequence & Alleles 🔠

Every gene has a unique series of DNA bases. Just like you can recognize your house by its design, scientists can recognize genes by their base sequence. Sometimes, genes have a slightly different sequence, known as alleles. Think of them as different color variations of the same car model!

 

🌟 Takeaway: Alleles are different versions of the same gene.

Real-World Example - PKU in Turkey & Australia 📊

Phenylketonuria (PKU) is a genetic disease that occurs in Turkey and Australia. Let's talk numbers

  • In Turkey, 1 in 2,500 babies has PKU. That's a lot!
  • In Australia, the PKU allele frequency is 0.01. That's like saying 1 in every 100 people is a carrier.

🤔 Discussion: What do you think? Are these rates higher or lower than you expected?

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IB Resources
Theme D - Continuity & Change
Biology HL
Biology HL

Theme D - Continuity & Change

Unlock the Secrets of Human Genes!

Word Count Emoji
532 words
Reading Time Emoji
3 mins read
Updated at Emoji
Last edited on 5th Nov 2024

Table of content

Hey future biologists! 👋 Let's dive into the amazing world of human genes, their locations, and how all this connects to real-life stuff like diseases. Trust me, it's not as hard as it sounds! Let's break it down.

What are Loci? 📍

First things first, each gene in your body has a 'home address' on a chromosome. This address is called its locus (plural: loci). Imagine your neighborhood as a chromosome and each house as a gene; the street address of each house is its locus. Cool, huh?

 

🌟 Takeaway: Locus is the specific location of a gene on a chromosome.

Base Sequence & Alleles 🔠

Every gene has a unique series of DNA bases. Just like you can recognize your house by its design, scientists can recognize genes by their base sequence. Sometimes, genes have a slightly different sequence, known as alleles. Think of them as different color variations of the same car model!

 

🌟 Takeaway: Alleles are different versions of the same gene.

Real-World Example - PKU in Turkey & Australia 📊

Phenylketonuria (PKU) is a genetic disease that occurs in Turkey and Australia. Let's talk numbers

  • In Turkey, 1 in 2,500 babies has PKU. That's a lot!
  • In Australia, the PKU allele frequency is 0.01. That's like saying 1 in every 100 people is a carrier.

🤔 Discussion: What do you think? Are these rates higher or lower than you expected?

Unlock the Full Content! File Is Locked Emoji

Dive deeper and gain exclusive access to premium files of Biology HL. Subscribe now and get closer to that 45 🌟