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.
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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
Slide 3 - Tekstslide
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
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X
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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