Transcript Genetics Notes - Warren County Schools

Biology
January 31st
Get out your annotated Blue
People article!
Reminders:

DNA Genetics Internet Activity due
tomorrow!!
Blue People of Troublesome Creek
Complete the following tasks with your
group:
 Create a list of the words you do NOT
know
 Shade the circles and squares of the
people who are blue in the pedigree
 Answer the following questions:
◦ What made some members of the Fugate
family blue?
◦ Who diagnosed the disorder?
◦ Why did the Fugates marry into their own
family?
◦ What two industries brought progress to KY?
Question of the Day!
 Why
don’t you look like the
person sitting next to you? (be
specific!)
Why do you look like that?
Genetics = Study of Heredity
Passing of genes, or traits,
from parent to offspring
Genes

Segments of DNA on chromosomes that
determine specific traits

Two forms of every gene!
◦ Called alleles
◦ Represented by capitol or lowercase letters
 Ex: H or h (same letter, different form)
◦ Alleles make up your genotype
◦ Genes determine your physical appearance!
Traits

Inherited Characteristics

Observable Traits = Phenotype
Physical
Characteristics
Ex: Hair color, eye color, freckles, dimples,
right-handed
Traits Continued

Dominant Trait = will always be seen
when a copy of the allele is present
◦ Represented by capitol letter
◦ Ex: Right-handed (H)

Recessive Trait = hidden when the
dominant allele is present
◦ Represented by lower case letter
◦ Ex: Left-Handed (h)
Genotype

The genes that are present in an individual
◦ Represented by 2 letters!

Homozygous: 2 of the same alleles or genes
◦ Homozygous dominant: 2 dominant alleles
 Ex: HH
◦ Homozygous Recessive: 2 recessive alleles
 Ex: hh

Heterozygous: 2 alleles that are opposite
◦ One dominant and one recessive
 Ex: Hh
Happy Friday!!
Turn in your DNA Genetics Internet
Activity
 Get out your Genetics Practice Problems
from Thursday, as well as your notes

Genetics Quiz TUESDAY!!
Practice #1
AA
Bb
Cc
DD
___________
___________
___________
___________
Practice #2
Green peas are dominant to
yellow peas
GG _____________
Gg _____________
gg _____________
Practice #3
Straight hair is dominant to curly.
_________ Straight
_________ straight (heterozygous)
_________ curly
Gregor Mendel

Austrian Monk who studied genetics in
pea plants
Punnett Squares
Used to predict the traits of offspring
Mom’s genotype
Dad’s genotype

Mendel’s Experiment

Parent Generation: TT x tt
(tall)
(short)
Mendel’s Experiment

First Generation: Tt x Tt
(tall)
(tall)
More Practice
Use the punnett square on #2 to answer the following
question:
If you crossed a heterozygous short haired guinea pig with a
long haired guinea pig, what percentage of the offspring would
have long hair?
In hobbits, hairy toes (H) are
dominant to smooth toes(h). Cross
a homozygous hairy toed hobbit
with a heterozygous hairy toed
hobbit.
In pea plants, purple flowers (P) are
dominant to white flowers(p).
Cross 2 homozygous purple flower
plants.
In guinea pigs, brown hair (B) is
dominant to spotted hair (b). Cross
2 heterozygous brown guinea pigs.
Widow’s peak (W) is dominant to a
smooth hairline (w). Cross a
woman who is homozygous for
widow’s peak with her husband,
who has a smooth hairline.
In Rasatafarians, dreadlocks are
dominant to baldness. Cross a
female who’ s bald with her
husband, who is homozygous for
dreads.