Lecture Exam 3 (Final Exam) Flashcards
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Replication of DNA is considered semi-conservative, meaning that the new helix(s) is composed of one ﹍﹍ strand and one﹍﹍ strand
one old stand and one new strand
Human genetic diseases resulting from errors in the inheritance of autosomes and sex chromosomes are primarily due to:
nondisjunction of the chromosomes
A Barr Body found in human white blood cells, is an example of what process?
Inactivaed X chromosome
The narrowed or constricted region on a duplicated chromosome where the two strands appear joined together is called the:
centromere
The research team of Hershey, Chase, et al confirmed what principle in their famous experiment?
that DNA is the genetic material
Cytokinesis is defined as the:
division of the cytoplasm
Gregor Mendel’s Law of Independent Assortment explains that the random separation of:
Genes located on different pairs of homologous chromosomes
An example of Heterozygous condition
(Genotype)
Aa
An example of Homozygous condition
(Genotype)
AA
An example of X-linked disease
Hemophilia
An example of Intermediate expression
color in snapdragons
An example of Co-dominance
ABO alleles
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Gregor Mendel was credited with establishing the principles of modern-day genetics. He coined the term “﹍﹍” to describe the condition of an allele that is always expressed in the presence of the other allele
dominant
The property that a normal cell exhibits when it responds to the presence of a barrier by halting cell division is defined as:
contact inhibition
Humans inherit:
(chromosomes)
22 pairs of autosomes and 1 pair of sex chromosomes
This genetic tracking method or chard is used to construct the patter of inheritance of one trait in a group of related people or relatives.
Pedigree
In Protein Synthesis, this molecule is responsible for the delivery of the Amino Acid to the ribosome-mRNA structure located in the cytoplasm
tRNA
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An individual with the genotype XYY has ﹍﹍Syndrome
Jacob’s Syndrome
This gene is considered one of the most important anti-oncogenes, or tumor suppressor genes, studied in humans
p53
True or False
The genetic code (nucleotide triplets) is universal to all organisms.
True
True or Flase
Females express more X-linked human disorders than males because they need only one copy of the recessive, disease gene.
False
Males have only one copy of the X chromosome, not females.
True or False
A gene frameshift mutation is considered a minor change in the DNA sequence that is not likely to cause signigicant harm to the cell or organism.
False
A frameshift mutation will cause the whole DNA sequence to be read wrong
True or False
In the genetic code, only 61 out of the 64 possible triplet combinations code for or signal an amino acid
True
This single gene is solely responsible for the onset of male development in a human embryo
SRY
The orientation of a strand of DNA is described as either being 5’–3’ or 3’–5’. This designation is based on:
the numbering of the carbon atoms in the sugar molecule
The orientation of the two strands in the DNA structure, with respecto to each other, are considered:
anti-parellel
A male who expresses the color blindness phenotype has this genotype:
Xᵇ Y
Outward apparance of a trait
Phenotype
Genes inherited for a trait
Genotype
Deletion at chromosome #5 produces
Cri-du-chat syndrome
Contains the anti-codon
tRNA
Duplication on a sex chromosome produces
Fragile X syndrome
In what phase does this occur?
Tetrads form and exchange genes
Lecture Exam 3
Prophase I
In what phase does this occur?
Chromosomes appear without crossing-over
Prophase II
In what phase does this occur?
Sister Chromatids separate
Anaphase II
What signals the start of Telophase
Cleavage Furrow
In what phase does this occur?
Homologous chromosomes separate
Anaphase I
