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