BIO 102-PRACTICE EXAM
QUESTIONS AND ANSWERS 2026
LATEST UPDATE
Which one of the following tends to reduce differences between populations over time
by transferring the alleles ? - ANSWERSGene flow
Genes that are present in more than one copy within a species are
called____________ genes. - ANSWERSparalogous genes
According to fossil evidence, horses evolved from a dog like creature some roughly ? -
ANSWERS60 million years ago
The first genes on Earth were probably? - ANSWERSAuto-catalytic RNA molecules.
The time required for 50% of the parent isotope to decay is called the_______________
of the isotope. - ANSWERShalf life
What describes the event when a few individuals become isolated from a larger
population? - ANSWERSfounder effect
When we say that an individual organism has a greater fitness than another individual,
we specifically mean that the organism - ANSWERSLeaves more viable fertile offspring
than others of its species.
Seasonal differences (spring vs fall) that prevent successful mating falls under the
category of ? - ANSWERStemporal isolation
When an organism transfers genetic information to another organism rather than its
offspring, it is referred as a _______________. - ANSWERShorizontal gene transfer
If instead of a "tree of life", one were to believe that life evolved as a "ring of Life", then
eukaryotes would have been formed from ___________________ between a bacteria
and an archaea. - ANSWERSendosymbiosis
Gene flow has the potential to increase the fitness of a population and also to decrease
it . - ANSWERStrue
During drought years on the Galapagos island, small seeds become rare, leaving
mostly large hard-cased seeds that only birds with large beaks could eat. If such a
drought persisted further, what should one expect to result from natural selection? -
ANSWERSThe offsprings produced in subsequent generations to have a higher
percentage of birds with large beaks
QUESTIONS AND ANSWERS 2026
LATEST UPDATE
Which one of the following tends to reduce differences between populations over time
by transferring the alleles ? - ANSWERSGene flow
Genes that are present in more than one copy within a species are
called____________ genes. - ANSWERSparalogous genes
According to fossil evidence, horses evolved from a dog like creature some roughly ? -
ANSWERS60 million years ago
The first genes on Earth were probably? - ANSWERSAuto-catalytic RNA molecules.
The time required for 50% of the parent isotope to decay is called the_______________
of the isotope. - ANSWERShalf life
What describes the event when a few individuals become isolated from a larger
population? - ANSWERSfounder effect
When we say that an individual organism has a greater fitness than another individual,
we specifically mean that the organism - ANSWERSLeaves more viable fertile offspring
than others of its species.
Seasonal differences (spring vs fall) that prevent successful mating falls under the
category of ? - ANSWERStemporal isolation
When an organism transfers genetic information to another organism rather than its
offspring, it is referred as a _______________. - ANSWERShorizontal gene transfer
If instead of a "tree of life", one were to believe that life evolved as a "ring of Life", then
eukaryotes would have been formed from ___________________ between a bacteria
and an archaea. - ANSWERSendosymbiosis
Gene flow has the potential to increase the fitness of a population and also to decrease
it . - ANSWERStrue
During drought years on the Galapagos island, small seeds become rare, leaving
mostly large hard-cased seeds that only birds with large beaks could eat. If such a
drought persisted further, what should one expect to result from natural selection? -
ANSWERSThe offsprings produced in subsequent generations to have a higher
percentage of birds with large beaks
