Questions to answer on Page 44 1. Gregor Mendel developed hereditary principles from his: A. Studies of pea plant crosses. B. Working model of the structure of DNA. C. Mapping the locations of human genes. D. Studying the fly Drosophila.

PROBLEMS: 2. Y stands for yellow peas and y for green. What color is dominant? 3. G stands for green coat color and g for white. What color is dominant? Recessive? 4. Using the letter S what is the symbol for smooth and wrinkled pod shape if smooth is dominant and wrinkled recessive?

5. write 2 things about the other parent.

Note: The dominant gene can be less common or more common than the recessive trait.

-Dominant traits in humans include dark eyes, dark hair, cleft chin, long eyelashes, clockwise hair whorl, free ear lobes, ability to roll tongue, left thumb on top with fingers interlocked. Recessive traits include blue or gray eyes, blond hair, smooth chin, attached ear lobes, inability to roll tongue, right thumb on top with fingers interlocked.

add to table of contents: Punnett Squares. page 46 Heredity notes add to table of contents: Punnett Squares page 46 Heredity notes page 47

Heredity Notes pg 47 Ex: tall, wrinkled, brown eyes. - phenotype - The traits that are expressed(show up) in an organism. Ex: tall, wrinkled, brown eyes. - genotype - The gene combination of an organism. Ex. Tt, Bb

alleles- alternate forms of a gene for each trait of an organism. Ex. Flower color: B = blue flower b = white flower

- heterozygous = hybrid =not having identical genes for a trait. Ex = Aa - homozygous = purebred = having identical genes for a single trait. Ex: AA BB = homozygous dominant aa = homozygous recessive

Punnett Square- Shows all possible gene combinations when 2 organisms are crossed.

X X X Y

X X X X X Y X X

X X X X X X X Y X Y X Y

Draw the Punnett square on page 46. Fill in the squares. R R R r

R R R R R r R R

R R R R R R R r R r R r

Do Guinea Pig punnett square assignment