Biology Warm-up (2-23-10): QUESTION: What the difference between dominant and recessive genes? ANSWER: Dominant is always expressed when present. Recessive.

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Presentation transcript:

Biology Warm-up (2-23-10): QUESTION: What the difference between dominant and recessive genes? ANSWER: Dominant is always expressed when present. Recessive is only expressed when no dominant genes are present.

Today’s Objectives: Students will be able to… Set-up and use a Punnett Square to predict traits in offspring Compare dominant and recessive genes and traits and observe them in humans.

Dominant and Recessive Traits Investigating Allele Frequencies in the Classroom

Tongue-Roller

Free earlobe

Widow’s Peak

Dimples on cheek

Long eyelashes

Natural dark hair

Curly hair

Brown, hazel / green eyes

Roman nose

Hair on mid digit

Right-Handedness

Right-Handedness

Bent little finger

Left thumb over right

Hitchhikers Thumb

Second Toe Longer

Cleft Chin

Freckles

Wet Earwax

Biology Cool-down (2-23-10): QUESTION: Are dominant traits more common then recessive ones? ANSWER: Not always. A recessive trait can be more common in some populations.