Biology SL

4

Chapters

553

Notes

Theme A - Unity & Diversity

Theme B - Form & Function

Theme C - Interaction & Interdependence

Theme D - Continuity & Change

Biology SL

434 words

3 mins read

Last edited on 14th Jun 2024

Hey there, future biologist! 🌟 Ready to unravel the secrets of how genes bounce around in a population? Let's dive into the awesome world of Hardy-Weinberg equilibrium and use it to solve some real-world mysteries! 🕵️♀️

Imagine you're in a big ol' candy store with only two types of candies - red and blue. If you know how many red candies are in the store today, could you guess how many will be there tomorrow? The Hardy-Weinberg equation is kinda like that, but for genes!

👉 **Equation**: p^{2}+^{2}pq + q^{2 }= 1

**p**: Frequency of dominant allele (Let's call this one "The Cool Kid")**q**: Frequency of recessive allele (Let's call this one "The Underdog")**p**: Frequency of homozygous dominant genotype (Two Cool Kids)^{2}: Frequency of heterozygous genotype (One Cool Kid hangs out with one Underdog)^{2}pq**q**: Frequency of homozygous recessive genotype (Two Underdogs)^{2}

Remember, p + q = 1 because there are only two alleles in this case, and they make up 100% of the gene pool.

**Albinism** is like nature's bleach; it takes away pigmentation in skin and hair. It's caused by a recessive allele.

**Frequency of albinism**: 1/20000- q
^{2 }= 1/20000 - q = \(\sqrt{\frac {1}{20000}}\) = 0.007

**To find p (the non-albino allele)**

- p + 0.007 = 1
- p = 0.993

**To find other genotypes**

- Homozygous dominant: p
^{2 }= 0.993^{2 }= 0.986 - Heterozygous:
^{2}pq = 2(0.993)(0.007) = 0.0139

👉 **Real-World Example**: Imagine a small town with 20,000 people. Based on these calculations, you'd expect just one person to have albinism! Think about it like finding a golden ticket in a huge pile of Willy Wonka chocolate bars. 🍫

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

Biology SL

434 words

3 mins read

Last edited on 14th Jun 2024

Hey there, future biologist! 🌟 Ready to unravel the secrets of how genes bounce around in a population? Let's dive into the awesome world of Hardy-Weinberg equilibrium and use it to solve some real-world mysteries! 🕵️♀️

Imagine you're in a big ol' candy store with only two types of candies - red and blue. If you know how many red candies are in the store today, could you guess how many will be there tomorrow? The Hardy-Weinberg equation is kinda like that, but for genes!

👉 **Equation**: p^{2}+^{2}pq + q^{2 }= 1

**p**: Frequency of dominant allele (Let's call this one "The Cool Kid")**q**: Frequency of recessive allele (Let's call this one "The Underdog")**p**: Frequency of homozygous dominant genotype (Two Cool Kids)^{2}: Frequency of heterozygous genotype (One Cool Kid hangs out with one Underdog)^{2}pq**q**: Frequency of homozygous recessive genotype (Two Underdogs)^{2}

Remember, p + q = 1 because there are only two alleles in this case, and they make up 100% of the gene pool.

**Albinism** is like nature's bleach; it takes away pigmentation in skin and hair. It's caused by a recessive allele.

**Frequency of albinism**: 1/20000- q
^{2 }= 1/20000 - q = \(\sqrt{\frac {1}{20000}}\) = 0.007

**To find p (the non-albino allele)**

- p + 0.007 = 1
- p = 0.993

**To find other genotypes**

- Homozygous dominant: p
^{2 }= 0.993^{2 }= 0.986 - Heterozygous:
^{2}pq = 2(0.993)(0.007) = 0.0139

👉 **Real-World Example**: Imagine a small town with 20,000 people. Based on these calculations, you'd expect just one person to have albinism! Think about it like finding a golden ticket in a huge pile of Willy Wonka chocolate bars. 🍫

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