 HAPPY WEDNESDAY 
BELLWORK:
Read the
following article
(at your desk on
yellow paper)
about SMA and
complete both
Punnett squares
to the right.
Small Group
CHAMPS
G2
Computer
SMA (spinal muscular atrophy) is a rare recessive genetic disorder.
Using a punnet square calculate the chance of a heterozygous (Both are
carriers) couple having a child with the disease.
N= normal central nervous system
n=spinal muscular atrophy
Blue eyes are due to a recessive allele (b). What is the chance of 2
heterozygous brown eyed people having a blue eyed child.
B=Brown eye color
b=blue eye color
Now what is the chance of the couple having a blue eyed child with the disorder?
N= normal central nervous system
n=spinal muscular atrophy
B=Brown eye color
b=blue eye color
NN Nn
BB Bb
Bb bb
Nn nn
¼
x
¼=
1/16
1 out of 16 chance of having blue eyes with
the disorder.
Now what is the chance of the couple having a brown-eyed child without the disorder?
N= normal central nervous system
n=spinal muscular atrophy
NN Nn
Nn nn
¾ x
B=Brown eye color
b=blue eye color
BB Bb
Bb bb
¾ =
9/16
9 out of 16 chance of having blue eyes with
the disorder.
Unit 5 – Genetics
1.
2.
3.
4.
5.
6.
7.
8.
9.
PG 70
Definitions Due Thursday (12/3/15)
All Parts Due Thursday (12/10/15)
Allele
10.Hybrid
18.Purebred
Co-Dominance
11.Incomplete
19.Recessive
Dominance
Dihybrid Cross
20.Sex-linked Traits
12.Monohybrid
Dominant
13.Multiple Alleles
Gene
14.Pedigree
Genotype
15.Phenotype
Gregor Mendel
16.Polygenic
Heterozygous
17.Punnett Square
Homozygous
Collect Today
Page 82 – Bikini Bottom Genetics
Page 80 – Pedigree Practice CORRECTIONS
Assigned
Page 70 – Notecard ALL PARTS (TOMORROW)
Most Missed MAKE-UP Quiz (TOMORROW)
Page 85 – Incomplete Practice (TOMORROW)
Genetics MAKE-UP Quiz (Monday)
Page 77 – Family Tree Project Part 2 (Monday)
Genetics Exam (Monday)
Genetics Vocabulary MAKEUP Quiz (WEDNESDAY)
Late
Page 80 – Pedigree Practice (-50%)
Page 74 – Family Tree Project Part 1 (-50%)
Direct
Instruction
CHAMPS
Essential Question
PG 83/85
What other forms of
dominance exist in
organisms?
Standard
B6F - Predict possible outcomes of genetic combinations such as
Non-Mendelian Genetics.
Mendel’s principles form
the basis of the modern
science of genetics.
The inheritance of
biological characteristics is
determined by individual
units called genes.
Genes are passed from
parents to their offspring.
In cases in which two or more forms (alleles) of the gene for a
single trait exist, some forms of the gene may be dominant and
others may be recessive.
In most sexually reproducing organisms, each adult has two
copies of each gene.
These genes are segregated from each other when gametes are
formed.
The alleles for different genes usually segregate independently of
one another.
There are exceptions
to most of Mendel’s
principles.
All genes do not show
simple patterns of
dominant or
recessive alleles.
Cases in which one allele is
not completely dominant
over another are called
incomplete dominance.
In this case, the
heterozygous phenotype
looks like a blending of the
two homozygous
phenotypes.
PG 85
Incomplete Dominance Example
Spongebob loves growing flowers for his gal pal, Sandy. She
loves the Poofkin flowers—red, purple, and blue!
Interestingly enough, the Poofkin flowers display incomplete
dominance in their genes for color.
1. Using “R” for red and “B” for blue, what would be the
genotypes for the following phenotypes?
red: ______
RR
purple: _____
RB
blue: _____
BB
2. Complete a Punnett square for a red Poofkin and a purple
Poofkin.
RB
Male:
RR
Female:
HW: Incomplete Practice
PG 85
Essential Question
How does the genotype
change with a dihybrid
cross?
Non-Mendelian Genetics Practice Problems
1.
2.
3.
PG 84
Incomplete
Spongebob
lovesDominance/Codominance
growing flowers for his gal pal, Sandy. She
1.
2.
3.
4.
loves the
Poofkin flowers—red,
purple,
and
blue!
Interestingly Blood
enough,
the Poofkin flowers display incomplete
Typing Problems
dominance
in their2.genes for color.
1.
3.
1. Using “R” for red and “B” for blue, what would be the
Sex-Linked Problems
genotypes for the following phenotypes?
red: ______
RR
purple: _____
RW
white: _____
WW
2. What are the genotypic and phenotypic ratios when you cross a purple radish with a white
radish?
Male:
RW
Female:
WW