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Genetics Questions
Pg 44
MENDEL AND GENETICS
pg 45
(then turn to Page 45 in notebook- page
253 in Biology textbook)
GREGOR MENDEL
• GREGOR MENDEL-
Austrian Monk-”father” of
genetics(=study of heredity)
• He did studies of heredity
on pea plants.
• -Mendel used true-breeding pea plants to
produce offspring with only 1 form of a
trait.
• Pea plants can cross-pollinate=male organs
of 1 plant fertilize female organs of
another plant.
P = parent, F1=first generation, F2=2nd
• They have 2 distinct sex cells: male and
female (called gametes)
• Trait - • -A characteristic or feature of an
organism that is passed from
parents to offspring.
• Ex: eye color, hair color, skin
color, tall, short. (This is why we
resemble our parents.)
Yao Ming & Earl
Boykins
• Heredity-
• the passing of traits from
parent to offspring.
• Genetics-
• the scientific study of heredity.
Purebred- • An offspring(baby) having all of
the same genes for traits
(Pure)
(ex. TTRR)
Hybrid-
• Having 2 different genes for
traits. (TtRr)
• Dominant- • The gene that shows up. (T)
• Recessive- • The gene that is hidden by
the dominant gene. (t)
• -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.
Questions to answer on Page
56
• 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. Tell 2 things about the other parent.