Incomplete dominance Female Father Turner’s Syndrome G.
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Transcript of Incomplete dominance Female Father Turner’s Syndrome G.
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Patterns of Heredity
Review
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What mode of inheritance shows a blending of a
trait?
Incomplete dominance
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What is the sex of this individual?
• Female
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Who determines the sex of a child?
Father
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Identify the disorder.
• Turner’s Syndrome
G
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What did Gregor Mendel use to conduct his
experiment?
Garden peas
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List 2 environmental (external) factors that can influence gene expression?
• Temperature• Radiation• Light• Chemicals• Virus/Bacteria
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Why do sex-linked traits occur more often in males than females?
•Males are missing the part of the Y
chromosomes that has these traits
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______ is anything that can cause a mutation
Mutagen
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What is an example of a sex-link trait?
•Hemophilia•Color-blindness•Baldness
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__________ inheritance is where more then ONE
gene is controlling a trait
Polygenic inheritance
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In a pedigree, how is death notated?
•A slash through the symbol
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I.
II.
The following pedigree shows individuals with blue eyes. Blue
eyes are recessive to brown. What is the dad’s genotype?
• Bb
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_____ is an abnormal number of chromosomes
Aneuploidy
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Body chromosomes; pairs 1-22 are called _____
Autosomes
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_____ is the failure of the homologous chromosomes to
separate during meiosis
Nondisjunction
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_____ is a chart where the chromosomes are arranged in their homologous pairs
Karyotype
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What would be an internal factor that can influence
gene expression?
Hormones
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An individual with the genotype IA i for their
blood type would have what blood type?
A blood type
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In a karyotype, chromosomes are matched according to ________, _______, and_____
•Size,•Banding Patterns,•Centromere location
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How many autosomal chromosomes are present?
• 44
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I.
II.
The following pedigree shows individuals with blue eyes. Blue eyes are recessive to
brown. What is the sex of their oldest kid?
• boy
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_____ is a mutation that occurs when a segment of a chromosome breaks off and
is reinserted backwards
Inversion
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____ mutation causes an error in DNA that adds or deletes a single base that causes all the following
amino acids to be affected
Frame shift mutation
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What trait is an example of multiple alleles?
Blood Types
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How many chromosomes does a human that has
Trisomy 21 have?
47
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A normal male karyotype would contain ____ as the
sex chromosomes.
XY
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Mutation that occurs when one chromosome of
a pair is missing is called _____
Monosomy
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Give an example of a genotype that would represent a carrier
female
XBXb
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When a chromosome breaks off & joins
another chromosome, this mutation is
called_____
Translocation
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What type of inheritance has the phenotype of the heterozygous offspring showing BOTH traits of
the homozygous parents?
Codominance
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What type of inheritance is shown when the trait occurs more frequently
in one sex than another?
Sex-Linked
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Suppose you were looking at a pedigree and you saw an individual’s genotype was labeled “R?”. What does
that genotype represent?
Dominant phenotype. But, you do not know if the other
allele is dominant or recessive
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What type of inheritance is exhibited when there
are more than 2 possible alleles for a certain trait
or phenotype?
Multiple alleles
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A mother who is heterozygous for type A blood marries a
man who is homozygous for B blood. What are the blood genotypes of the children?
• 50% IAIB
• 50% IBi
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In pedigrees, how are males and females
represented?
Males – squaresFemales - circles
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What type of inheritance pattern would you use a prime (‘) to
notate the alternate form of an allele?
Incomplete dominance
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What do the roman numerals represent that
are labeled on a pedigree?
Generation numbers
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How many autosomes does a human have?
44 or 22 pairs
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A normal female karyotype would contain
____ as the sex chromosomes.
XX
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I.
II.
The following pedigree shows individuals with blue eyes. Blue
eyes are recessive to brown. What is the mom’s genotype?
• bb