Transcript Do Now - Edward H. White Biology

You should be working on the diagram
column.
Draw a picture illustrating the terms you
selected.
If you still need to complete the
definitions or sentences work on those
too!
What are we learning?
Last Class
Today
 Baby Lab pg 14
 Analysis Questions were to
be completed for home
learning!
 Notes: Genetics day 2- pg 17
 Review page 14 baby analysis
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questions
Review page 15 homework 13, 15,
17
Complete page 17 Notes:
genetics day 2
Complete lab pg 188 in textbook
on page 16 in notebook
White board practice
Independent practice/ home
learning
Students should be able to identify,
analyze, and/or predict inheritance
patterns caused by various modes of
inheritance such as dominant,
recessive, codominant, sex-linked,
polygenic, and multiple alleles
Open your notebook to pg 14
 Let’s check and discuss your baby lab
questions.
 Homework grade. 
Open your notebook to pg 15
 Let’s check and discuss your old
homework.
 We are going to focus on #13, 15, 17.
Open your notebook to pg 17
 We need to complete our notes.
 Remember you should be using a
highlighter keeping in mind your
flashcards!
What is a dihybrid cross?
 A test cross to determine the possible outcomes of two
traits
 Example: What is the chance that I will roll a 6 on one
dice and a 2 on the other?
 Example: What are the possible outcomes of breeding a
tall green pea plant with a yellow short pea plant?\
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Could you end up with a tall yellow plant?
How do we set up a dihybrid cross?
 Foiling- Like in your math class!
Dihybrid cross- Can you interpret
this?
 The parents’ genotypes were
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RrYy
RrYy
 Can you foil these parent
genotypes?
Page 16 in your notebook
 We are going to reflect on what we just learned about
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DIHYBRID CROSSES.
In groups we will complete the lab on page 188 in the
textbook.
YOU ARE SMART AND TALENTED!
I KNOW IT!
DO YOU?????
White Board Practice Time!
 Send the tallest person from your group
to pick up your supplies:
 White board
 Dry Erase Marker
 Paper towel/ eraser
 Remember proper behavior!
 Volume
level 1-2
Let’s practice:
Green eyes are
dominant and yellow
eyes are recessive.
The genotype of two
insects are Gg and Gg.
Complete a Punnett square!
G
g
G
GG
Gg
g
Gg
??
?? = gg
What % of the young
would have green
eyes?
75%
Yellow eyes?
25%
Long neck is dominant and
short neck is recessive.
If dad giraffe is
heterozygous and mom
giraffe is heterozygous,
what percent of the
offspring will probably
have long necks? short
N
n
N
NN
Nn
n
Nn
nn
75% Long
25% Short
Test Cross
 You cross a homozygous red flower with a homozygous
white flower to obtain an F1 generation. Please give the
genotype and phenotype of the F1.
 Red is dominant, white is recessive.
 Use the Punnett-square method
Answer
 Genotype: 100% Rr
 Phenotype: 100% red
One more practice!
 Black is dominant to white. A white cat mates with a
heterozygous black cat, what are the possible
phenotypes for their kittens?
A. 100% black
B. 100% white
C. 50% black, 50 % white
D. 75% black, 25% white
Beyond Dominant and Recessive
 First we will review each term then we
will practice!
 Incomplete Dominance
 Codominance
 Multiple Alleles
 Polygenic Traits
 Sex Linked Traits
Incomplete Dominance
 The heterozygote has a
phenotype that is
somewhere in between
the phenotype of both
homozygotes
Incomplete Dominance
 Sponge Bob loves growing flowers
for his pal Sandy! Her favorite
flowers, Poofkins, are found in red,
blue, and purple. If R represents a red
gene and B represents a blue gene what
would be the correct genotype of the
flowers with a purple phenotype?
Multiple Alleles
 More than two possible alleles exist for a trait
 Example- Blood typing
 Type A
 Type B
 Type AB
 Type O
Multiple Alleles practice
 Blood type is controlled by 3 alleles: A, B, O.
 A & B are codominant, O is recessive.
a) What are the two genotypes possible for a person who
as A blood?
b) What genotype does a person with AB blood have?
c ) What genotype does a person with O blood have?
d) What are the two genotypes possible for a person who
has B blood?
Codominance
 Heterozygous alleles
are BOTH expressed
 Neither is dominant
nor recessive
Codominance practice- AB blood type
 A wealthy elderly couple die together in an
accident. Soon a man shows up to claim
their fortune, saying that he is their only son
who ran away from home as a boy. Other
relatives dispute his claim. Hospital records
show that the deceased man was type AB
and the woman was type O. The claimant to
the fortune was type O.
 Could he be their son?
Polygenic traits
 Controlled by two or more genes
Polygenic traits practice
A person with black hair has the
genotype AABBCC. A person with dirty
blonde hair has the genotype AAbbcc.
If these two individuals mate. What will
the genotype of their offspring be?
Remember, each parent can only
contribute 1 allele (letter) per gene.
Sex linked genes
 Genes that are located on the sex chromosomes
 X or Y
 EX: Colorblindness, hemophilia
Sex Linked genes practice
 Hemophilia is a recessive disease caused by a gene
found on the X chromosome. Therefore, it is referred
to as a sex – linked disease. The recessive allele (Xh)
causes the disease.
 A normal man marries a woman that is heterozygous
for the trait. What is the chance that they will have a
child with hemophilia?
Independent practice
 You will now get the opportunity to demonstrate all
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that you have learned.
Volume level 0
Use your brain first, notes second, and raise your hand
for help third
Anything not completed in class will become home
learning
Extra credit opportunity on the next slide!!!
Extra Credit:
 Page 219 Investigation Incomplete dominance
 It will help you get a little boost early on in the third 9
weeks!