Hereditary (Bio)
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27 Terms
Allele
Different forms of a gene
Homozygote
Same Alleles (AA, aa)
Heterozygote
Different Alleles (Aa)
Genotype
Allele combination
Phenotype
Observable trait
Dominant expression
1 copy (allele symbol - A)
Recessive expression
2 copies (allele symbol - a)
Simple dominance
Inheritance types: AA, Aa → Dominant; aa → Recessive
Incomplete dominance
Inheritance types: Heterozygote blend (Red x White → Pink)
Co-dominance
Inheritance types: Both alleles expressed (AB)
Allele blood type =
IA, IB, i
IA &IB blood type =
Co-dominant
i blood type =
Recessive
IAIA/IAi →
A
IBIB/IBi →
B
IAIB →
AB
ii →
O
Sex-linked inheritance
Gene on X chromosome
Male
XY → 1 recessive allele shows trait
Female
XX → Needs 2 recessive alleles
Square on pedigree chart
Male
Circle on pedigree chart
Female
Shaded on pedigree chart
Affected
Half-shaded on pedigree chart
Carrier
Pedigree Charts show…
Inheritance across generations
Autosomes (non-sex)
22
Last chromosome
23rd (sex; XX & XY)
Note 
Flashcards (105)