22-11-2023 3T

• Biologie
• Middelbare school
• vwo
• Leerjaar 3

Genetics

Today

1. Study lethal alleles
2. Study pedigree charts
3. Work on assignments

Learning goals:
1. You can solve a genetics problem for a monohybrid cross with lethal alleles.
2. You can interpret a pedigree.

4) B = brown

    b = silverblue 

       Bb x bb

 F1:   B     b

    b   BB   Bb

    b   Bb   bb

25% homozygous dominant

50% heterozygous

25% homozygous recessive

Genotypic ratio = 1:2:1

Phenotypic ratio = 3:1

Lethal alleles

Lethal alleles

4) B = brown

    b = silverblue 

       
Bb x bb

 F1:   B     b

    b   BB   Bb

    b   Bb   bb

25% homozygous dominant

50% heterozygous

25% homozygous recessive

Genotypic ratio = 1:2:1

Phenotypic ratio = 3:1

Silverblue bb
b = lethal allele

2:1

X

Assignment

1. Page 10,11 & 12 of the genetics stencil workbook
2. Done? Use your laptop and study: khan academy pedigrees
3. Done? Khan academy: Multiple alleles, incomplete dominance, and codominance

Discussion about the questions allowed.

Need help? Use the 3Bs!

1. Book

2. Brain

3. Buddy

If all 3Bs fail, ask the teacher.