Introduction to Genetics Heredity….. Gregor Mendel Austrian Monk --Discovered a “pattern”...
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Transcript of Introduction to Genetics Heredity….. Gregor Mendel Austrian Monk --Discovered a “pattern”...
Introduction to Genetics
Heredity….
Gregor Mendel
Austrian Monk--Discovered a “pattern”
while working in the garden
PEAS have “traits” or characteristics
--color of flower--color of seed--height of plant
Pea Plant Experiment
Purple x WhiteFlower Flower
All offspring PURPLE
(Parents) P1
( Kids)F1
Mendel’s Experiment
Some TRAITS, such as purple color of the flower, OVERTAKES the other color white.
A dominant trait, if present, will “overtake” the other trait and will be expressed.
Therefore, PURPLE IS DOMINANT to white.
Pea Plant Experiment…. Part 2
Purple X Purple flower flower
¾ were purple ¼ were white
Mendel’s Experiment, part 2
Some traits will “reappear” ….such as the white color of the pea plant flower.
RECESSIVE traits often will “hide” in one generation but then “appear” in another.
WHITE FLOWER is RECESSIVE to the PURPLE FLOWER
Mendel’s Experiment OVERVIEW
Purple Flower x White Flower
All purple flowers
Purple flower x Purple Flower
¾ Purple Flowers¼ White Flowers
Generation 1
Generation 2
REALIZATIONS from MENDEL’s experiment
*Some traits are “dominant” and others are recessive
*The kids must “get information” from the parents
-- Genes control a “trait” Alleles are different versions of a gene
“P” purple (we will use CAPITAL letters for dominant traits)
“p” white (we will use LOWER CASE letters for recessive traits)
Additional Vocabulary
Phenotype is the “physical trait description”Purple flower or white flower
Genotype is the combination of “alleles or genes”
PP or Pp this would represent purplepp this would represent white
Gather information from your parents….
You need to collect some information from your parents and siblings (as well as yourself).
Use the next part to help you collect your data….
Traits….
Traits…
Traits…
Huber’s FamilyTraits Jeff Terra Ty
Forelock (widow’s peak)
No forelock No forelock No forelock
Dimples (cleft chin) No Yes Yes
Thumb Straight Straight Straight
Pinky Straight Bent Bent
Mid-Digit hair Yes No No
2nd Toe Shorter Longer Longer
Tongue Rolling Can roll Can roll ??