Download Chapter 5 Heredity

Chapter 5 Heredity
Pages 125-143
Genetics terminology
 Traits – things that you inherit from your
parents
 Heredity – the passing of traits from parents
to offspring
 Genetics- the study of how the traits are
inherited
 Probability- the chance that something will
take place (odds)
 The code for traits is carried on
chromosomes
 This code is called the genotype.
 The result of the code is called the phenotype
 Tongue Rolling example
 Genotype can be
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Heterozygous
Homozygous
Vocab we all need to know…
 Dominant Trait–
 Recessive Trait Heterozygous Homozygous Genotype Phenotype
Pompe Disease
It is a recessive disease.
The Punnett Square
 1. Traits
 2. Parents
 Punnett Square
 Genotypes and %
 Phenotypes and %
Mice and Fur Problem
Gregor Mendel – The father of
genetics
 Worked with pea plants (30,000 total)
 Found out that some traits were dominant
and some recessive
Mendel’s Laws of Heredity
 1. Traits are controlled by alleles on
chromosomes.
 2. Alleles can be dominant or recessive.
 3. During meiosis the chromosomes that
carry the two forms of the allele go into
separate sex cells (gametes).
 Punnett Square
Fruit Fly Lab
Genetics News
Punnett Square Practice
 1a.
BB x bb
Problem 1b.
 Bb x Bb
Problem 2a Yy x Yy
Problem 2b
Yy
x
yy
Conclusion….
 According to my to hypothesis our prediction
of male to female should have 1:1. Our data
was close, for example
Incomplete Dominance
 When you have two alleles and both are
dominant.
Sex Linked Traits
 Traits that associated with being male or
female
Hemophilia
How to do a punnett square for sexlinked traits.
 In humans colorblindness is a sex-linked
recessive trait. Show the possible children of
a female carrier and a normal male.
ATB-In mice having fur is a dominant trait, what
can you say about the genotype of this creature?
Fly lab 2
Punnett Square Problems
Lemming Lab
 http://www2.edc.org/weblabs/Punnett/punnett
squares.html
Problem 2
Problem 3 Fly Packet Dihybrid cross
 Fly Lab # 3 Dihybrid Cross
 Predictions for Phenotypes
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Orange & Round = 56.25%
Orange & Bar = 18.75%
Black and Round = 18.75%
Black and Bar = 6.25%
Lab
 Four different colors of dice
 Female

Blue (body color)
Yellow (eye shape)

Male

White (body color)
 Black (eye shape)

Human Sex Determination
 Human Chromosomes
 Hemophilia a sex linked disease
Fly packet conclusions due
Wednesday….
 For each give a purpose statement saying
what was the lab about.
 Type your conclusion
 Colorblindness is a sex-
linked disease, show
the offspring of a female
carrier and a male with
the disease.
 color vision test
Incomplete Dominance
 In some flowers white
and red flowers have
incomplete dominance.
What types of offspring
could a red and white
flower have?
Polygenic Inheritance
 When many genes contribute to a trait.
 It produces a wide variety of results in the
phenotype.
 Hair color, eye color, height, weight,
Blood Type
 3 genes determine blood type,A, B, O
 You only get 2 at a time
 A and B are “co-dominant”
 O recessive
 blood type
Portfolios Due Tuesday
 50-50 chances lab
 Pea pod lab
 Coin flip lab
 Polygenic lab (height)
 Lemming lab
 Green pepper lab
 Punnett square ws
 Fly packet
 Punnett square quiz
 Inherited traits (face)
 Biologica (dragon)
 Fly conclusions
 Punnett sq. review
 Chapter rev
 crossword
 NTWS
Make your own color blindness test
Blood Type
 Multiple alleles
 Co-dominance
 Blood Type
Gene Possiblities
Chart of Blood Types
Blood Type
Antigens on the
blood cell
Antibodies in
blood
A
A
B
B
B
A
AB
Both AB
None
O
None
AB
 Universal Donor – can give blood to anyone

Type O
 Universal Recipient – can get blood from
anynone

Type AB
ATB
 Could a man who is type AB blood have a
child who is type O?
 Could a man who is type A blood have a child
who is type O?
Vocab List for the Quest
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Heredity
Alleles
Genetics
Dominant
Recessive
Genotype
Phenotype
Homozygous
Heterozygous
Co-Dominance(incomplete Dominance)
Polygenic Inheritance
Sex-linked traits
Pedigree