TTU Biology 1402 Exam 2- Dr. Held
Questions & Answers (Grade A+)
Karyotyping (#chromosome) -
correct answer ✅-To determine if the patient has an abnormal # of
chromosomes
- "A photographic inventory of an individual's chromosomes."
- ordered display of chromosomes, doubled.
Criss- Cross Inheritance -
correct answer ✅Sons inherit their X chromosome from their
mother
Codominance -
correct answer ✅-The heterozygote expresses both traits (alleles).
-"A" and "B" genes make structures (not enzymes)= sugar types.
-Ex) Blood types (A,B, AB, O)
Multiple Alleles (complication) -
correct answer ✅- >2 alleles/genes in the population (=more
suits/decks of cards).
-Ex. 1: Blood types (3 alleles): A,B,O.
-EX. 2: *Major Histocompatibility complex (MHC) has dozens of
alleles*--> *tissue/transplant rejections*
,TTU Biology 1402 Exam 2- Dr. Held
Questions & Answers (Grade A+)
Epistasis -
correct answer ✅-One gene masks or "dominates" the effects of
another.
-(ex. colour of fur in dogs. BB=black, Bb=black, bb= brown, ee=no
pigment--> yellow)
Polygenic Traits -
correct answer ✅-One trait is caused by *many genes* (whose
effects are additive).
-Quantitive traits (height, weight, etc.)= often polygenic.
-Ex). Human skin colour: 4 genes. Shades of brown
Pleiotropy -
correct answer ✅-One gene causes *many traits*. Ex). Albino
mutation--> white hair, pink iris, crossed eyes
X chromosome inactivation -
correct answer ✅-Occurs in mammals and leads to Mosaicism
(purpose= dosage comp)
mRNA -
correct answer ✅-Messenger RNA
, TTU Biology 1402 Exam 2- Dr. Held
Questions & Answers (Grade A+)
-Encodes amino acid sequences and carries information into the
cytoplasm
rRNA -
correct answer ✅-Ribosome RNA
-This and proteins make ribosomes (most abundant kind of RNA)
tRNA -
correct answer ✅-Transfer RNA
-Interprets codons into proteins
Double Helix -
correct answer ✅-Shape of DNA found by Watson & Crick in 1953
- a twisted ladder: rungs=base+ base bond, sides =sugar+
phosphate bond.
A2+T or G2+C
Complimentary -
correct answer ✅-Property of DNA
Questions & Answers (Grade A+)
Karyotyping (#chromosome) -
correct answer ✅-To determine if the patient has an abnormal # of
chromosomes
- "A photographic inventory of an individual's chromosomes."
- ordered display of chromosomes, doubled.
Criss- Cross Inheritance -
correct answer ✅Sons inherit their X chromosome from their
mother
Codominance -
correct answer ✅-The heterozygote expresses both traits (alleles).
-"A" and "B" genes make structures (not enzymes)= sugar types.
-Ex) Blood types (A,B, AB, O)
Multiple Alleles (complication) -
correct answer ✅- >2 alleles/genes in the population (=more
suits/decks of cards).
-Ex. 1: Blood types (3 alleles): A,B,O.
-EX. 2: *Major Histocompatibility complex (MHC) has dozens of
alleles*--> *tissue/transplant rejections*
,TTU Biology 1402 Exam 2- Dr. Held
Questions & Answers (Grade A+)
Epistasis -
correct answer ✅-One gene masks or "dominates" the effects of
another.
-(ex. colour of fur in dogs. BB=black, Bb=black, bb= brown, ee=no
pigment--> yellow)
Polygenic Traits -
correct answer ✅-One trait is caused by *many genes* (whose
effects are additive).
-Quantitive traits (height, weight, etc.)= often polygenic.
-Ex). Human skin colour: 4 genes. Shades of brown
Pleiotropy -
correct answer ✅-One gene causes *many traits*. Ex). Albino
mutation--> white hair, pink iris, crossed eyes
X chromosome inactivation -
correct answer ✅-Occurs in mammals and leads to Mosaicism
(purpose= dosage comp)
mRNA -
correct answer ✅-Messenger RNA
, TTU Biology 1402 Exam 2- Dr. Held
Questions & Answers (Grade A+)
-Encodes amino acid sequences and carries information into the
cytoplasm
rRNA -
correct answer ✅-Ribosome RNA
-This and proteins make ribosomes (most abundant kind of RNA)
tRNA -
correct answer ✅-Transfer RNA
-Interprets codons into proteins
Double Helix -
correct answer ✅-Shape of DNA found by Watson & Crick in 1953
- a twisted ladder: rungs=base+ base bond, sides =sugar+
phosphate bond.
A2+T or G2+C
Complimentary -
correct answer ✅-Property of DNA
