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17 variations on Mendels Themes .pdf



Original filename: 17 variations on Mendels Themes.pdf
Title: Chapter 7: A View of the Cell
Author: Hoggard

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Variations
on
Mendel’s
Themes

Incomplete Dominance
• Appearance of a 3rd Phenotype
• The phenotype of the heterozygote is
intermediate between the 2
homozygotes
• Use uppercase letter and uppercase
prime
– RR= Red
1 1
– R R = White
1
– RR = Pink

Incomplete Dominance
R 1R 1

RR
X

RR1

Incomplete Dominance
• Cross 2 pink snapdragons
•Phenotypic results
•Genotypic results

Codominance
• Expression of both alleles
• The phenotype of the heterozygote
shows both phenotypes of the 2
homozygotes
• Use 2 different uppercase letters
– B for black feather chicken
– W for white feather chicken

Codominance
BB

WW

X
BW

Black and white
Checkered
Chicken

Codominance
• Cross 2 checkered chickens

Phenotypic results
Genotypic results

Multiple Alleles
• More than 2 alleles for a trait exist
in a population
• Complicated inheritance rules
• Human blood type
– 3 Alleles
• IA and IB : codominant
• i : recessive

Human Blood Type
Blood type is determined by protein on
the outside of red blood cells


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