Worksheets7th Science Chapter 4 review
Total questions: 30
Worksheet time: 48mins
What did Gregor Mendel do to study different characteristics in his genetics experiments?
He cross-pollinated both plants and animals.
He cross-pollinated plants.
He studied only tall and short pea plants.
He studied only asexual plants.
What does a Punnett square show?
all of Mendel’s discoveries about genetic crosses
only the dominant alleles in a genetic cross
only the recessive alleles in a genetic cross
all the possible outcomes of a genetic cross
A purebred chicken with white feathers is crossed with a purebred chicken that has black feathers. Each of their offspring has both black and white feathers. Why does this happen?
Both alleles for feather color are dominant.
Both alleles for feather color are recessive.
The alleles for feather color are neither dominant nor recessive.
Several alleles work together to determine the trait.
What happens during meiosis?
Two sex cells combine.
Each sex cell copies itself to form four new chromosomes.
Chromosome pairs remain together when new sex cells are formed.
Chromosome pairs separate and are distributed into new sex cells.
Which term refers to physical characteristics that are studied in genetics?
traits
offspring
generations
hybrid
Which of the following traits is influenced by both inheritance and environmental factors?
the ability to sing well
natural hair color
the ability to cough
dyed hair color
Factors that control traits are called
genes.
recessives.
purebreds
parents.
Scientists call an organism that has two different alleles for a trait a
dominant.
purebred.
hybrid.
factor.
What does the notation Tt mean to geneticists?
two dominant alleles
homozygous alleles
one dominant allele and one recessive allele
two recessive alleles
What is probability?
the actual results from a series of events
the way the results of one event affect the next event
a number that describes how likely it is that an event will occur
the number of times a coin lands heads up
If a homozygous black guinea pig (BB) is crossed with a homozygous white guinea pig (bb), what is the probability that an offspring will have black fur?
25 percent
75 percent
50 percent
100 percent
When sex cells combine to produce offspring, each sex cell will contribute
one fourth the number of chromosomes in body cells.
the normal number of chromosomes in body cells.
twice the number of chromosomes in body cells
half the number of chromosomes in body cells.
A heterozygous organism has
two identical alleles for a trait.
two different alleles for a trait.
only one allele for a trait
three different alleles for a trait
Chromosomes are made up of
one pair of alleles.
male and female sex cells.
a phenotype and a genotype.
many genes joined together.
Which term refers to the passage of genetic instructions from one generation to the next?
DNA
Heredity
Behavior
Inheritance
Which term refers to physical characteristics that are studied in genetics?
Generations
Offspring
Hybrids
Traits
Which term refers to an organism’s physical appearance, or visible traits?
Genotype
Phenotype
Inheritance
Recessive allele
Mendel concluded that the alleles for tall stems in pea plants are dominant. Thus, crossing a purebred tall pea plant with a purebred short pea plant should result in
all tall plants
all medium height plants.
all short plants.
half short and half tall plants.
What is the probability of producing a tall pea plant from a genetic cross between two hybrid tall pea plants?
1 in 4
3 in 4
2 in 4
4 in 4
An organism's genotype is its
acquired traits.
physical appearance.
genetic makeup.
biological classification.
A rabbit is homozygous recessive for fur color. This statement describes the rabbit's
phenotype.
acquired traits.
genotype.
biological classification.
What is the term that describes an organism that has two identical dominant or two identical recessive alleles for a particular trait?
Codominant
Homozygous
Heterozygous
Phenotype
The different forms of a gene are referred to as
phenotypes.
alleles.
genotypes.
traits.
Which of the following statements about passing traits from parents to offspring through sexual reproduction is true?
Different offspring of the same parents can have different characteristics.
Traits are genetically determined after an organism is born.
All offspring of the same species will be identical to each other.
Only one parent contributes traits to its offspring.
A flower's color is a trait that is passed from one generation to the next generation. How a trait such as flower color is physically expressed after being passed from one generation to the next generation is called a(n)
allele.
genotype.
chromosome.
phenotype.
What is heredity?
The passage of behaviors from one generation to the next
The passage of characteristics from one generation to the next
The passage of patterns from one generation to the next
The passage of genetic instructions from one generation to the next
How can two organisms have the same phenotype but different genotypes?
One organism is heterozygous and one is homozygous for a recessive allele.
Both organisms have heterozygous alleles for the trait.
One organism is heterozygous and one is homozygous for a dominant allele.
Both organisms have homozygous alleles for the trait.
Consider a grasshopper species where each sex cell has 12 chromosomes. When two grasshopper sex cells join, what is the number of chromosomes in the new cell?
48
12
24
6
Which type of reproduction involves the joining of sperm and egg?
Acquired
Inherited
Asexual
Sexual
Which offspring have a better chance of surviving changes in the environment?
The offspring of budding
The offspring of sexual reproduction
The offspring of asexual reproduction
All of the above
