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THE MONOHYBRID CROSS
FOLLOWING THE INHERITANCE OF ONE TRAIT
TODAY’S BIG WORDS• MONOHYBRID
• ALLELE
• DOMINANT
• RECESSIVE
• HOMOZYGOUS
• HETEROZYGOUS
• GENOTYPE
• PHENOTYPE
CROSSING TWO PLANTS
SHORTTALL X
ALL TALL
PARENTS
OFFSPRING
TODAY’S BIG WORDS• MONOHYBRID – Following one trait
• ALLELE
• DOMINANT
• RECESSIVE
• HOMOZYGOUS
• HETEROZYGOUS
• GENOTYPE
• PHENOTYPE
ADD THE SYMBOLISM
SHORTTALL X
ALL TALL
PARENTS
OFFSPRING
TT tt
Tt
EGGS AND POLLEN???
SHORTTALL X
ALL TALL
PARENTS
OFFSPRING
TT tt
Tt
T tGAMETES
TODAY’S BIG WORDS• MONOHYBRID – Following one trait
• ALLELE – One form of a gene
• DOMINANT
• RECESSIVE
• HOMOZYGOUS
• HETEROZYGOUS
• GENOTYPE
• PHENOTYPE
TODAY’S BIG WORDS• MONOHYBRID – Following one trait
• ALLELE – One form of a gene
• DOMINANT – Trait that always shows up
• RECESSIVE
• HOMOZYGOUS
• HETEROZYGOUS
• GENOTYPE
• PHENOTYPE
TODAY’S BIG WORDS• MONOHYBRID – Following one trait
• ALLELE – One form of a gene
• DOMINANT – Trait that always shows up
• RECESSIVE – Trait that can hide
• HOMOZYGOUS
• HETEROZYGOUS
• GENOTYPE
• PHENOTYPE
THE PUNNETT SQUARE
GAMETES GO HERE
THE PUNNETT SQUARE
OFFSPRING GO HERE
THE PUNNETT SQUARE
T T
t Tt Tt
t Tt Tt
TODAY’S BIG WORDS• MONOHYBRID – Following one trait
• ALLELE – One form of a gene
• DOMINANT – Trait that always shows up
• RECESSIVE – Trait that can hide
• HOMOZYGOUS – Has the same alleles
• HETEROZYGOUS
• GENOTYPE
• PHENOTYPE
TODAY’S BIG WORDS• MONOHYBRID – Following one trait
• ALLELE – One form of a gene
• DOMINANT – Trait that always shows up
• RECESSIVE – Trait that can hide
• HOMOZYGOUS – Has the same alleles
• HETEROZYGOUS – Has different alleles
• GENOTYPE
• PHENOTYPE
CROSSING TWO OFFSPRING
TALLTALL X
???????
PARENTS
OFFSPRING
EGGS AND POLLEN???
TALLTALL XPARENTS
Tt Tt
T tGAMETESt T
POTENTIAL FOR DIFFERENT OFFSPRING
TALLTALL XPARENTS
OFFSPRING
Tt Tt
T tGAMETESt T
TT TALL
POTENTIAL FOR DIFFERENT OFFSPRING
TALLTALL XPARENTS
OFFSPRING
Tt Tt
T tGAMETESt T
Tt TALL
POTENTIAL FOR DIFFERENT OFFSPRING
TALLTALL XPARENTS
OFFSPRING
Tt Tt
T tGAMETESt T
tt SHORT
THE PUNNETT SQUARE
T t
T
t
THE PUNNETT SQUARE
T t
T TT Tt
t Tt tt
TODAY’S BIG WORDS• MONOHYBRID – Following one trait
• ALLELE – One form of a gene
• DOMINANT – Trait that always shows up
• RECESSIVE – Trait that can hide
• HOMOZYGOUS – Has the same alleles
• HETEROZYGOUS – Has different alleles
• GENOTYPE – GENE TYPE (the letters)
• PHENOTYPE
TODAY’S BIG WORDS• MONOHYBRID – Following one trait
• ALLELE – One form of a gene
• DOMINANT – Trait that always shows up
• RECESSIVE – Trait that can hide
• HOMOZYGOUS – Has the same alleles
• HETEROZYGOUS – Has different alleles
• GENOTYPE – GENE TYPE (the letters)
• PHENOTYPE – WHAT IT LOOKS LIKE
PHENOTYPES
T t
TTT
tall
Tt
tall
tTt
tall
tt
short
GENOTYPES
T t
TTT
Homozygous dominant
TtHeterozygous
t TtHeterozygous
TtHomozygous
recessive
