WorksheetsSemester 2 Final Review Part 1
Total questions: 25
Worksheet time: 13mins
The appearance of a recessive trait in offspring of animals most probably indicates that
neither parent carried a recessive gene for that trait.
one parent was homozygous dominant and the other parent was hybrid for that trait.
both parents carried at least one recessive gene for that trait.
one parent was homozygous dominant and the other parent was homozygous recessive for that trait.
Which of the following genotypes would be considered to be homozygous?
bb
Bb
By
by
In a population of dogs, curly hair is dominant over straight hair. If two parents are heterozygous for this trait, what is the probability that any of their offspring will have straight hair?
100%
0%
75%
25%
Mutations can be transmitted to the next generation only if they are present in
sex cells.
body cells.
muscle cells.
brain cells.
Which of the following genotypes would be considered to be heterozygous?
bb
Bb
BB
by
Which of the following shows the normal sex chromosomes of a male?
XX
XY
XXY
XO
Which of the following shows the normal sex chromosomes of a female?
XX
XY
XXY
XO
Which statement best describes the fertilized egg that would result if this sperm and egg cell unite?
it would contain 46 sex chromosomes and develop into a male
it would contain 44 autosomes and develop into a female
it would contain 44 autosomes and develop into a male
it would contain 46 sex chromosomes and develop into a female
Cells become differentiated with specialized structures and functions when they
express different genes.
have different DNA.
randomly express genes.
express all of the same genes.
Gametes are produced by the process of
mitosis.
meiosis.
replication.
crossing-over.
A typical human body cell has 46 chromosomes. How many chromosomes come from each parent?
46
92
23
8
Which pair of gametes can unite to produce a zygote that will develop into a normal human male embryo?
The pedigree chart represents the inheritance of color blindness through 3 generations Colorblindness is an X-linked recessive trait.
Which is a true statement about the genotype of Generation 2 person 2 (2-2) and Generation 3 person 3 (3-3) regarding color blindness?
Person 2-2 is a carrier, and Person 3-3 is homozygous.
Both are homozygous recessive.
Person 2-2 is homozygous dominant, and Person 3-3 is a carrier.
Both carry one recessive allele.
A square in a pedigree chart represents
a carrier.
a homozygous dominant individual.
a male.
a female.
A circle in a pedigree chart represents
a carrier.
a homozygous dominant individual.
a male.
a female.
A sperm cell of an alligator has 16 (haploid) chromosomes. What is the total number of Chromosomes (diploid) normally present in a body cell of this alligator?
16
8
32
48
Evolution can best be described as
a process of change through time.
the formation of fossils.
a process of growth in an organism.
the change in size of body structures through use and disuse.
A population of finches that have three different beaks live on an island. Each beak type is adapted to one of three specific food sources. Two of the three food sources are eliminated during a drought. What will happen first to this finch population?
All three finches will die.
The finch that is adapted to the remaining food source will survive.
All three finches will adapt to the remaining food source.
The food sources will adapt to the finches.
Which is the best example of natural selection?
the environment changes and the organisms migrate to a more favorable environment
organisms of one species cooperate to force other species to migrate or become extinct
a farmer allows only the strongest sheep to breed
organisms with beneficial genetic variations tend to survive and reproduce
What most likely caused the current distribution of moth wing color?
production of fungus induced gene mutations
ingestion of pigmentation from fungus spores
natural selection of favorable variations
inheritance of an acquired characteristic
Natural selection can best be defined as
elimination of the smallest organisms by the largest organisms
survival and reproduction of those organisms that occupy the largest area in the environment
survival and reproduction of those organisms genetically best adapted to the environment
survival of the strongest organisms
Which of the following ecosystems would survive the best if a major change were to Occur?
an area with two types of plants
an area with no diversity of species
an area with a high diversity of species
an area with a low diversity of species
The fox of Catalina Island does not resemble the fox on the mainland. The most likely reason for the difference in their appearance is
a high mutation rate
due to geographic isolation
due to large population sizes
lack of selection pressure on both group
The American toad breeds earlier in the spring than the Fowler's toad does. Therefore, they do not interbreed, even though they often live in the same habitat. Which conclusion can best be drawn from this information?
the two species do not interbreed because of geographic isolation
Fowler's toad has a higher rate of survival than the American toad does
the two species do not interbreed because of a form of temporal isolation
adaptive mutations occurred more often during the evolution of the American toad
The type of reproductive isolation that occurs when a species can no longer interbreed because they are physically separated by a geographic barrier is called
geographic isolation
temporal isolation
behavioral isolation
boundary isolation
