Final Exam Flashcards
which of the following situations will lead to natural selection
all of the above
what is the difference between micro - & macroevolution
micro - describes population
macro - describes over time
population genetics is the study of what
how allele frequencies in a population change over time
individuals from islands fly to the other to stay. This can alter after the allele frequencies of the population through which of the following mechanisms
gene flow
which of the following pairs do both evolutionary processes introduce new genetic variation into a population
mutation & gene flow
the wing of a bird & the arm of a human are examples of what
homologous structures
the fact that DNA sequences are more similar in more closely related organisms is evidence of what
descent with modification
which situation would most likely lead to allopatric speciation
a flood causes the formation of a new lake
which variable increases the likelihood of allopatric specification taking place more quickly
longer distances between divided groups
what process in the human life cycle results in the production of gametes
meiosis
what is a specific segment on DNA that directs protein syntheses
gene
which scientific concept did Charles Darwin & Alfred Wallace independently discover
natural selection
which of the following is true regarding interphase
it is the longest phase of cell division
during which phase of the cell cycle does growth occur
interphase
what structure dissolves so that the sister chromatids can move to the opposite ends of the cell during cell division
centromere
which type of cell division is responsible for the repair of your skin following a sunburn
mitosis
during which phase of mitosis would you expect to see chromosomes consisting of two chromatids within the nucleus
prophase
during which phase of mitosis do spindle fibers pull the chromosomes to opposite poles of the cell
anaphase
how many chromosomes pairs would be shown in a normal human karyotype
23
which of the following is not associated with mitosis
production of sperm
which of the following is a result of meiosis
half the # of chromosomes in the daughter cells
how many nuclear divisions occur during meiosis
2
when does the reduction in chromosome numbers occur
anaphase II
crossing over results in
new genetics combinations
nondisjunction in the female could lead to which of the following
all of the above
molecules that store & process genetic info. are
nucleic acids
a nucleotide consist of
a 5 carbon sugar / nitrogenous base / phosphate group
the structure of RNA differs from DNA in that
the backbone of RNA contains ribose
nucleotides have a nitrogenous base attached to a sugar at the
1’ carbon
which of the following nitrogenous bases is NOT found in DNA
uracil
which of the following does cytosine pair with
guanine
eukaryotes contain a WHAT chromosome
double - stranded circular
a diploid cell has __ the number of chromosomes as a haploid cell
twice
an organisms traits are determined by the specific combination of inherited
genes
