Heredity: Question Preview (ID: 3793)

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Animals that reproduce sexually differ from animals that reproduce asexually in that sexually reproducing animals have
a) a larger number of offspring
b) more genetic variation among their offspring
c) offspring that are nearly identical to their parents
d) offspring that are perfectly adapted to their parents' habitat

When sex cells combine to produce offspring, each sex cell will contribute
a) half of the nomal number of chromosomes.
b) one fourth of the normal of chromosomes.
c) twice the normal number of chromosomes.
d) the normal number of chromosomes.

Single celled organisms can produce and create cells exactly like themselves without combining genes from two different parent cells. This is an example of
a) asexual reproduction
b) gamete formation
c) natural selection
d) sexual reproduction

Which of the following describes the advantages of asexual reproduction?
a) It limits the spread of detrimental characteristics in a species.
b) it allows for more genetic diversity to be passed along.
c) It increases the amount of resouces needed for a species to live.
d) It causes new types of species to be produced regularly

Salamanders can reproduce both sexually and asexually. Which is an advantage of sexual reproduction?
a) They do not need to find a mate.
b) Offspring are genetically identical to the parents.
c) No variations in the species will occur.
d) New combinations of traits are produced.

Sexual reproduction can cause an organism to develop a new characteristic. Which of the following new characteristics might help a lizard that lives in green, grassy areas survive
a) developing a longer tail
b) becoming colorblind
c) becoming green-colored
d) developing shorter legs

Cheetahs are an endangered species. Ther are fewer cheetas for mating. What genetic effects will this have on the species' chances for survival?
a) The genetic variability will be limited, decreasing chances of survival.
b) The genetic variability will increase, increasing chances of survival.
c) The genetic variability will not change; chances of survival will not be affected.
d) Since the cheetahs are endangered, they have no chance of survival.

According to the theory of natural selection, a species that lacks the variations necessary to adapt to a changing environment will most likely
a) become dormant
b) mutate
c) become extinct
d) fossilize

Rainfall in a tropical region is below average for 10 years. Which statememt best explains why insects adapted for dry conditions are now much more plentiful.
a) Biodiversity in the region has increased due to the dry conditions.
b) Insects with a high tolerance for dry conditions have migrated out of the region.
c) Natural selection has favored insect species with a high tolerance for dry conditions.
d) Natural selection has selected against insects species that are adapted for dry conditions

Fossils from ancient sea a shells are located in layers of rock formed out of compacted particles of sand. Why is this species of animal now extinct?
a) The species could not exsist in compacted sand.
b) The species was unable to adapt to environmental changes.
c) The species successfully adapted to environmental changes.
d) The local environment changed slowly enough for other species to adapt.

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