5/11/15 SUCCESS Have out something to read or study

5/11/15 WARM UP Make a list of 3 physical characteristics you received from your mom & 3 from your dad – If not sure, make a list of common physical characteristics/traits ANNOUNCEMENTS: – TEST FRIDAY – Read chpt 4:1,2 & 4 by Wednesday

TRAITS & CHARACTERISTICS Acquired vs. Inherited xjSE xjSE

TOPIC: GENETICS EQ: How are traits passed?

I. Gregor Mendel Austrian Monk Crossed pea plants and saw what traits were passed on from generation to generation Heredity: the passing of physical characteristics from parents to offspring Trait: each different form of a characteristic (green or yellow plant)

II. Mendel’s Experiments Crossing Pea Plants: – Fertilization: when the egg and sperm of an organism join to create a new organism – Purebred: the offspring of many generations that have the same trait

II. Mendel’s Experiments F1 Cross: Tall x Short Offspring: All tall

II. Mendel’s Experiments F2 Cross: Tall x Tall Offspring: 3 tall & 1 short

III. Dominant & Recessive Alleles – Concluded that traits can mask, or hide, other traits or factors Tallness masks shortness trait – Genes: the factors that control a trait from the DNA – Alleles: Different forms of the gene (tall vs. short) and what is inherited from parents (ma allele & pa allele)

III. Dominant & Recessive Alleles – Dominant allele: a trait that masks the other trait and always shows up in an organism – Recessive allele: the hidden trait when a dominant is also present – Purebred – Hybrid: when an organism has two different alleles for the same trait Ex: Tall (ma allele) & Short (pa allele)

III. Dominant & Recessive Alleles – Symbols: use letters to represent dominant or recessive Dominant: capital letters Recessive: lower case letters

Practice #1 F1 Cross: Tall x Short

Practice #2 F2 Cross: Tall x Tall

Pea Plants

Human Traits Free ear lobes (E) Attached ear lobes (e) Widow’s peak (w) No widow’s peak (W) Cleft chin (C) No cleft chin (c) Dimples (D) No dimples (d) PTC (T) No PTC (t)