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Flashcards in Week FO, FO SHO Deck (136)
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91

Despite marked molecular heterogeneity, thalessemia molecular defects are limited in each at risk population, and 4-10 mutations account for ________ of dz alleles

75-95

92

What is the appropriate order for molecular genetic testing in thalessemias?

1) target mut analysis 2) mut scanning 3) seq analysis

93

What is the most common mutation that causes hemophilia?

Unequal crossover between intronic sequences Most likely need to use protein analysis - wont be detected via sequencing or northern blotting

94

How many skin cells do we lose an hour?

40K

95

DNA extractions include solvent based, boiling and silica based. Identify key differences.

large dsDNA, high purity, RFLP and PCR used - Solvent based = time consuming, difficult to adapt to automation - SIlica Based = 1 hr per sample, amenable to automation small ssDNA, low purity, PCR used - Boiling - 30 min per sample

96

What are two characteristics in nuclear DNA used in forensic profiling?

short tandem repeats (STRs) single nucleotide polymorphisms (SNPs)

97

SNPs are less variable than STRs. Their low mutation rate makes them great for paternity testing. When are they used to analyze DNA?

When DNA is degraded since more abundant than STRs

98

mtDNA is more abundant than nucDNA but there is less variation. When is mtDNA used over nucDNA?

when nucDNA degraded found on hair shafts, bones and decomposed samples

99

Fingerprinting process employed by the FBI uses what as CODIS core loci?

13 STR loci and one amelogenin gene (sex-linked)

100

Variable number tandem repeats can be detected via PCR, sequencing and ________

Southern blotting

101

STR genotyping occurs via

PCR (fluorescently labeled is great!) Allelic size and ID determined with gene mapper ID software. Data presented via allele size and intensity.

102

What is CODIS?

combined DNA index system, can be used nationally

103

What are the factors that influence DNA usefulness in profiling?

- rough/smooth surface - time of contact - regularity of contact by others - shedder/nonshedder status - time since last handwash

104

In which situations would Y-STR profiles be useful?

- vasectomized or azzospermic males in sexual assault - samples with a lot of female DNA - male-male mixtures such as gang rape - body fluid mixes (blood/saliva)

105

Which is the most polymorphic? a) VNTR b) SSLPs c) STRs d) SNPs

c

106

Describe the differences between spirituality and religion

Spirituality - internal to individual, based upon individual experience, quest for meaning or connectedness Religion - organized, based upon collective experiences, holy books, institution

107

What are FICA questions

- Faith and Belief - Importance - Community (part of religious community, anyone really important to you) - Address (how would you like me to address this in your care)

108

when is a discussion of spirituality NOT welcome? a) pt is seriously ill and may die b) pt is newly diagnosed with or suffering from serious illness c) pt is newly diagnosed with or suffering from mild illness d) patient is suffering grief over loss e) none of the above - always welcome

c

109

Describe the kinetic approach to diagnosing anemia

Mechanism responsible - Decreased production (iron deficiency, bone marrow problem, low erythropoietin) - Increased destruction (hemolysis due to bad transfusion) - Blood loss (trauma, GI bleeding)

110

DDX is developed based on RBC size then narrowed based on ___________

cell morphology, retic count

111

What are morphological differences between Reticulocytes and RBCs?

larger, blue tint, lack central pallor

112

What are morphologies seen in beta thalessemia trait?

target cells, hypochromic, microcytic

113

Which of these would NOT cause normocytic anemia? a) iron deficiency b) blood loss c) bone marrow suppression d) renal insufficiency e) hyperthyroid

e) HYPO

114

Which of these would NOT cause macrocytic anemia? a) iron deficiency b) alcohol abuse c) folate deficiency d) vitamin b12 deficiency e) liver disease

a) iron deficiency - see in microcytic and normocytic

115

Hypersegmented neutrophils are seen in what?

folate deficiency

116

What are common sx of anemia?

fatigue, DOE, dizziness, poor feeding in infants, bleeding (heavy menses, melena, hematochesis, hematuria)

117

What are common physical findings in anemia?

orthostatic HTN, tachycardia, pallor, jaundice, murmur, splenomegaly, liver changes

118

Which of these would NOT cause microcytic anemia? a) iron deficiency b) cu deficiency c) zn poisoning d) hypothyroid e) thalessemia

d) seen in macro and normo

119

How can you differentiate between males and females by looking at neutrophils?

Females - barr bodies (drumsticks) behind lobes Males - more lobes

120

From which blood vessel would you see bright red blood and increased pressure? a) artery b) vein

a)