Homologous structures, such as a bat wing and whale flipper,
have the same underlying structure due to inheritance from a common ancestor.
What is the repressor in the lac operon system?
a protein that blocks transcription when lactose is not present
Many commercial pesticides become less effective after 2-3 years because
pests with resistant genes will survive and reproduce.
Birds with extravagant plumage may be able to pass their genes to the next generation better than
drab birds because they
are more likely to attract a mate.
The most important kind of selection acting on a well-adapted population in a relatively constant
Sexual displays and contests common in the Animal Kingdom (such as Bighorn Sheep bashing
their heads together) result in?
Blue-footed boobies of the Galapagos will only mate after a very specific courtship display on the
part of the male. He high-steps to advertise his bright blue feet What isolating mechanism
discourages mating outside the species?
two populations of mountain dwelling salamanders are separated by an impassable valley. The
the genetic code is redundant, which means that
most amino acids are coded for by more than one codon.
Biotechnology can be defined as the use of living organisms to create products or to facilitate
process. Restriction enzymes are one kind of tools required by this technology. What roles do
restriction enzymes play?
They cut DNA at specific sites.
Which of these definitions of species most closely fits the biological species concept?
Members of the same species can mate and produce fertile offspring.
A population of deer was threatened with overpopulation until cheetahs were imported. After a
couple of years, there were fewer deer but the average running speed of the deer had increased.
This is an example of
the half life of a radioactive isotope is 10,000 years. This isotope and its breakdown product do not
normally occur together when molten rock cools and becomes solid. If you have a volcanic rock
sample containing 0.25 grams of the radioactive isotope and 0.75 grams of its breakdown product,
when did this rock likely solidify? 25) A
20,000 years ago
What is one of the ways that RNA is different from DNA?
RNA is found in the cytoplasm as well as in the nucleus.
Which of these gases was absent in the early earth atmosphere at the time life first appeared?
Which of the following is the best description of a gene?
a segment of DNA that is transcribed into a mRNA, a tRNA or an rRNA
Two nearby populations in which there is some movement of individuals between the populations are an example of
disruptive selection operates whenever
the extremes in a distribution of phenotypes are more fit than the average
Shrews have been documented to travel across frozen lakes and establish populations on previously uninhabited islands. This is an example of
The theory of natural selection states that
the best adapted individuals survive and reproduce contributing the most genes to the next generation.
What determines which traits will be passed on to the next generation in the greatest frequency?
how well that trait contributes to successful reproduction in a given environment
Which of these types of Galapagos species most influenced Darwin to develop the theory of species change by natural selection?
Which of the following possibilities is the best indicator of an organism's evolutionary fitness?
the number of offspring it produces over its lifetime that survive to breed
imagine a population of monkeys in South America whose habitat has been reduced to the point
where only 25 monkeys survive. This is an example of
Which of the following males in a given population would be considered the most fit in an evolutionary sense? One that produced
two offspring, both of which survived and produced offspring of their own.
Which group of vertebrates were the first to evolve a waterproof egg allowing the group to move away from bodies of water to reproduce?
In the fossil record, species suddenly appear, remain more or less unchanged for varying periods of geologic time, and then disappear from the record. This trend best supports the theory of