Inheritance
Genotype geneticconstitution of an organism
phenotype expressionof this genetic constitution and its interaction with the
environment
Gene length of DNA that is a sequence of nucleotide bases thatnormally code
for a particular polypeptide
locus position of a gene on a particular DNAmolecule
Allele different forms of thesamegene
codominant 2alleles contribute to thephenotype
Monohybrid Inheritance
Inheritanceof a single
gene
PureBreeding Anorganism with a specific trait is bred witheach other so they
consistently give rise to plants withthat specifictrait
F Offspringof parents
F2 Offspringof 2 F s
, Dihybrid Inheritance
2characteristicdetermined
by 2 differentgene located on differentchromosomes
are inherited
Examples
R Roundseeds r wrinkledseeds
G Green seeds g a yellow seed
Parental Genotypes PossibleGametes
Mother RrGg RG Rg RG rg
father Rr RG Rg RG rg
Gg
PunnetSquare
Mother
RG Rg RG rg
RG RRGGRRGgRrGGRrhg Round 1 Green 9
g Rg RRGgRRggRingRrgg Round 1 Yellow 3
K
RG RrGGKragrrGGring wrinkled 1Green 3
rg Krag RrggrragrrggI wrinkled1Yellow 1
HeterozygousCross has ratio93 3 I
Ratio of 93 3it gives rise tothe law of independent assortment whereeach
member of a pair of alleles maycombine witheitherofanother
pair
Genotype geneticconstitution of an organism
phenotype expressionof this genetic constitution and its interaction with the
environment
Gene length of DNA that is a sequence of nucleotide bases thatnormally code
for a particular polypeptide
locus position of a gene on a particular DNAmolecule
Allele different forms of thesamegene
codominant 2alleles contribute to thephenotype
Monohybrid Inheritance
Inheritanceof a single
gene
PureBreeding Anorganism with a specific trait is bred witheach other so they
consistently give rise to plants withthat specifictrait
F Offspringof parents
F2 Offspringof 2 F s
, Dihybrid Inheritance
2characteristicdetermined
by 2 differentgene located on differentchromosomes
are inherited
Examples
R Roundseeds r wrinkledseeds
G Green seeds g a yellow seed
Parental Genotypes PossibleGametes
Mother RrGg RG Rg RG rg
father Rr RG Rg RG rg
Gg
PunnetSquare
Mother
RG Rg RG rg
RG RRGGRRGgRrGGRrhg Round 1 Green 9
g Rg RRGgRRggRingRrgg Round 1 Yellow 3
K
RG RrGGKragrrGGring wrinkled 1Green 3
rg Krag RrggrragrrggI wrinkled1Yellow 1
HeterozygousCross has ratio93 3 I
Ratio of 93 3it gives rise tothe law of independent assortment whereeach
member of a pair of alleles maycombine witheitherofanother
pair
