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Modes of inheritance
Genetic diseases and modes of inheritance
78
Biology
12th Grade
10/27/2008

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Term
pedigree
Definition
A chart that shows genetic relationships among related individuals
Term
inheritance of marfan's syndrome
Definition
autosomal dominant
Term
how do you know if something is dominant by a pedigree
Definition
it is in every generation
Term
how do you know if something is autosomal in a pedigree
Definition
it shows up in both sexes
Term
what do recessive diseases do in pedigrees
Definition
skip generations
Term
sex-linked traits are
Definition
passed from mother to son
Term
sex-links traits in daughters
Definition
from fathers/ daughters only carriers
Term
polygenic traits
Definition
governed by more than one gene
Term
karyotype
Definition
The number, size and shape of the chromosomes of a somatic cell arranged in a standard manner.
Term
how many chromosomes does a normal person have
Definition
46
Term
how many chromosomes does each parent give to offspring
Definition
23 (half)
Term
sex chromosomes
Definition
x and y
Term
autosomes
Definition
22 pairs of chromsomes other than sex chromosomes
Term
how many bases/ genes does chromsomes 22 (smallest) have
Definition
43 million/ 545 genes
Term
chromosomal address x(q or p)y find x
Definition
chromosome number
Term
chromosomal address x(q or p)y find p or q
Definition
q is long arm and p is short arm
Term
chromosomal address x(q or p)y find y
Definition
distance from centromere
Term
central dogma of biology
Definition
DNa to protein to trait/ DNA contains the code for making proteins and proteins determines the trait
Term
what do genes do
Definition
code for proteins
Term
what do proteins do?
Definition
carry out a function for the organism
Term
what do mutated genes result in?
Definition
non-functioning proteins
Term
why is alkaptonuria special?
Definition
it was the first disorder to be associated with a gene
Term
symtoms of alkaptonuria
Definition
blackened urine; arthritis
Term
how is alkaptonuria inheritated
Definition
autosomal recessive
Term
why is alkaptonuria autosomal recessive?
Definition
often skipped a generation; inbred people
Term
who coined inborn errors of metabolism? and when?
Definition
Garrod; 20th century
Term
why is urine balck in alkaptonuria?
Definition
HGA accumulated in urine
Term
How is HGA produced?
Definition
when amino acids phenylalanine and tyrosine are broken down
Term
what is responsible for breaking down HGA
Definition
an enzyme
Term
how many enzymes are defective in alkaptonuria?
Definition
one
Term
What is responsible for screwing up the enzyme that breaks down HGA
Definition
a gene
Term
what is an inborn error of metabolism?
Definition
inherited condition where an enzyme is not functioning
Term
autosomoal dominant is when
Definition
a condition is dominant and not on a sex chromosome
Term
autosomal recessive is when
Definition
a condition is not on a sex chromosome and is recessive
Term
sex-linked conditions are
Definition
usually located on the X chromosome and occur more in males
Term
how rare is alkaptonuria?
Definition
1 in 250,000
Term
how many mutations in the gene HGD are known to cause Alkaptonuria?
Definition
65
Term
how is PKU, phenyketonuria inherited?
Definition
autosomal recessive
Term
what does the mutation that causes PKU do?
Definition
screws up gene that makes the enzyme that breaks down phenylalanine
Term
what builds up in a person with PKU?
Definition
phenylalanine
Term
what does a build up of phenylalanine cause?
Definition
mental retardation
Term
what is the treatment for PKU?
Definition
alow phenylalanine diet
Term
what does the enzyme effected during PKU usually do?
Definition
breaks down phenylalanine into tyrosine
Term
how is huntington's disease inherited
Definition
autosomal dominant
Term
who first described huntington's disease?when?
Definition
George Huntington in 1872
Term
symptoms of huntington's chorea?
Definition
chorea refers to lack of muscle control
Term
what causes lack of muscle control in huntington disease?
Definition
loss of neurons in brain
Term
when do symtoms begin in huntington's disease?
Definition
fifties
Term
Nancy Wexler and huntington's disease
Definition
research lead to discovery of gene and development of genetic test
Term
what causes the mutation of the gene that causes huntington's?
Definition
too many repeated triplets of CAG
Term
what does CAG code for in the huntington's disease?
Definition
the amino acid glutamine
Term
what is prophyria?
Definition
The vampire disease/ disorders that cause abnormalities in the chemical steps the lead to heme production
Term
what is heme?
Definition
a component of hemoglobin that carries oxygen to the blood
Term
where is heme found?
Definition
mostly in blood, the liver, and marrow
Term
what does the mutation in porphyria do?
Definition
screws up heme production
Term
what enzyme is lacking in prophyria?
Definition
ferrochelatase
Term
what is the symptoms of porphyria?
Definition
sun-sensitive , cramps, seizures, purples urine, hallucinations
Term
what caused the madness of King George?
Definition
variegated prophyria
Term
why were king george's symtoms so severe?
Definition
a medicine he took contain arsenic which interferes with heme production
Term
what are the symptoms of marfan syndrome?
Definition
long limbs and fingers/long face/vision problems/ heart problems
Term
what is the mode of inheritance of prophyria?
Definition
dominant
Term
what is the nheritance of marfan's?
Definition
dominant
Term
what is marfan's syndrome a disorder of ?
Definition
connective tissue
Term
what chromosome is the mutation that causese marfan's?
Definition
15
Term
what protein is coded for in the gene where the marfan's mutaiton takes place?
Definition
fibrillin
Term
fibrillin
Definition
binds itself to other proteins and molecules to form microfibrils
Term
microfibrils
Definition
become part of the fibers that provide strength and felxibility to connective tissue
Term
how is werewolf syndrome (hypertrichosis)inherited
Definition
sex-linked on x chromosome
Term
what kind of mutation happens in werewolf syndrome?
Definition
an atavistic mutation (return to ancestral phenotype)
Term
werewolf syndrome in women
Definition
much more rare/ due to x chromosome inactivation/ hair occurs in patches
Term
how is hemophilia inherited?
Definition
sex-linked in the x chromosome
Term
what famous person had hemophilia
Definition
Queen Victoria of England
Term
what are the symptoms of hemophilia?
Definition
blood doesn't clot normally/ internal bleeding
Term
how many genes cause hemophilia?
Definition
two genes/ two types of hemophilia
Term
old treatment of hemophilia
Definition
transfusion of blood/plasma
Term
70-80s treatment of hemophilia
Definition
clotting factors transfused (contracted AIDS a lot)
Term
Treatment of hemophilia now
Definition
cultures of clotting factors
Term
future treatment of hemphilia
Definition
gene therapy
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