Heredity• How would you describe yourself so that

someone would recognize you?• What traits make you unique and different

from others?

Cornell NotesConcept Notes Trait

Dominant Trait I think… Recessive Trait I think…Heredity

A quality or characteristic that describes something.Physical Traits: Can be seen by others

Ex: Eye color, hair color, height, left handed

Hand Clasp Right over Left?

What do these words mean?

Dominant and Recessive

Cornell NotesConcept Notes Trait A quality or characteristic that describes something.

Physical Traits: Can be seen by others Example: Eye color, hair color, height, left handed

Dominant Trait

I think…

Recessive Trait

I think…

Heredity

most important, powerful, or influential

tending to go backward or recede

Cornell NotesConcept Notes Trait A quality or characteristic that describes something.

Physical Traits: Can be seen by othersEye color, hair color, height, left handed

Dominant Traits

I think . . . most important, powerful, or influential

An inherited character determined by a

RecessiveTraits

I think . . . tending to go backward or recede

An inherited character determined by a

Heredity

dominant gene

recessive gene

Dimples (DD, Dd) No Dimples (dd)

Detached (EE, Ee) or attached (ee) Earlobes

Freckles (FF, Ff) No Freckles (ff)

Can Tongue Roll (TT, Tt) or Can’t (tt)

Normal (BB, Bb) Color Blindness (bb)

Can you see the number inside the circle?

If you cannot, you may be colorblind

What traits do you have?• Work with your partner and help each other

identify what traits you have.

• Under observation, record the trait you have

• Next, identify if your traits are Dominant or Recessive.

• When done, answer the “Think Critically Questions.”

• Exceeds: circle other traits that you express

What traits do we have in common?

Cornell Notes

Concept Notes Trait A quality or characteristic that describes something.

Physical Traits: Can be seen by othersEye color, hair color, height, left handed

Dominant Traits An inherited character determined by a dominant gene

RecessiveTraits

An inherited character determined by a recessive gene

Heredity The passing of traits from parents to children

Dominant or Recessive?

Homework: Survey family genetic traits!

Brown eyes

Red hair

Dimples

Attached earlobes

A trait determined by

a dominant geneA trait determined

by a recessive gene

Right (RR, Rr) or Left (rr) handed?

Curly (HH, Hh) or Straight (hh)

Cleft Chin (CC, Cc) or No Cleft (cc)

Widow’s Peak (WW, Ww) or Straight (ww)

Allergies (AA, Aa) or No Allergies (aa)

What are traits?• Physical Traits

– Can be seen by others– Eye color, hair color, height, left handed

• Acquired Traits– Learned skills– Playing a sport, riding a bike, playing a musical

instrument

• Behavioral Traits– Instinctual actions– Nest building and migration

Review Terms Used in Modern Genetics

• Genotype– The particular alleles (genes) an individual carries– They are inherited from your biological parents– Genes control your traits

• Phenotype– An individual’s observable traits

• What people can SEE when they look at you

Review Terms Used in Modern Genetics

• An individual with non-identical alleles of a gene is heterozygous for that gene– Examples: Bb, Tt, Aa

• An individual with identical alleles of a gene is homozygous for that gene– Examples: BB or bb, TT or tt

Terms Used in Modern Genetics

• An allele is dominant if its effect masks the effect of a recessive allele paired with it– Capital letters (A) signify dominant alleles;

lowercase letters (a) signify recessive alleles– Homozygous dominant (AA)– Homozygous recessive (aa)– Heterozygous (Aa)

Data

• We will now record our class data and graph our results

• Does our data support which genes are dominant and which genes are recessive?

• What about the whole 7th grade?