Download Genotype Phenotype - LS-FIG-F12

What you should
remember from Genetics
Presented by: Deoxyribonucleic Awesome
AKA: Justine, Deonna, Anam and Raquel
Overview:
Pedigrees
Genotypes/Phenotypes
Types of Dominance
Relation to Bio 112
Genotypes and Phenotypes:
Differences?
 Genotype: The genetic makeup, or set of
alleles, of an organism
 Geno.:
Pheno.:
 DD, Dd
blue fish (dominant)
 Dd
red fish (recessive)
 Phenotype: The observable traits of an
organism
Types of Dominance
 Complete dominance: One allele is completely
dominant over the other.
 Example: If one parent has brown eyes (BB) and the
other parent has blue eyes (bb), the offspring will
have brown eyes.
 Allele
Contribution to Phenotype
 B
Brown eyes (dominant)
 b
Blue eyes (recessive)
 Genotype
Phenotype
 BB
Brown eyes (dominant)
 Bb
Brown eyes (dominant)
 bb
Blue eyes (recessive)
Incomplete Dominance:
 When two alleles together produce a third
phenotype
 Ex. Flower colors:
 A red flower (RR) and a white flower (rr) will
produce a pink flower (Rr).
 Allele
Contribution to Phenotype
 R
Red (incomplete dominance)
 r
White (incomplete dominance)
 Genotype
Phenotype
 RR
Red
 Rr
and
Pink (intermediate between red
white)
 rr
White
Co-Dominance:
 When both alleles express themselves
 Example:
 Genotype
Phenotype
 I^A I^A
Type A
 I^BI^B
Type B
 ii
Type O
 I^A i
Type A
 I^B i
Type B
 I^AI^B
Type AB
Relation to Bio 112:
 Evolution
 Hardy-Weinberg Principle (p + q = 1)