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WorksheetsGenetics and Heredity
Total questions: 36
Worksheet time: 26mins
Genes are sections of DNA that contain information about a specific trait.
True
False, hybrid
In sexual reproduction, one organism makes a copy of its genes and itself.
True
False, asexual
A gene with different information for a trait is called an allele.
True
False, hybrid
Selective breeding is the selection and breeding of organisms for desired
traits.
True
False, variation
The alleles of all the genes on an organism’s chromosomes make up
its (a) .
An organism with two identical alleles for a trait is (a) .
The way the traits of an organism appear, or are expressed, is
its (a) .
An organism that has two different alleles for a trait is (a) .
A (a) allele is hidden whenever the dominant allele is present.
A(n) (a) shows genetic traits that were inherited by members of a family.
A Punnett square is used to predict
exact outcomes.
probable outcomes.
methods to reach all outcomes.
Blood type in humans is an example of
multiple alleles.
a sex-linked trait.
polygenic inheritance.
Which tool can be used to display genetic traits in a family tree?
a pedigree
a Punnett square
a genetic mutation
A Punnett square shows that the probability of having a recessive
phenotype expressed in a monohybrid cross is
0 percent.
25 percent.
50 percent.
75 percent.
Mendel crossed two hybrid pea plants with green pods and observed which
ratio of pea pod color in offspring?
1:3 yellow: green
1:4 yellow: green
1:3 green: yellow
1:4 green: yellow
Occurs when both alleles for the gene are expressed equally
(a)
A(n) (a) organism is the offspring of many generations of organisms that have the same trait.
If a(n) (a) allele is present, its trait will appear in the organism.
Mendel used the principles of (a) to predict what percent of offspring would show a particular trait.
Alleles that are neither dominant nor recessive produce an inheritance pattern known as (a) .
The process in which a parent cell divides twice to produce sex cells is called
(a) .
What is the chromosome theory of inheritance?
Chromosomes are carried from parents to offspring on hybrids.
Genes are carried from parents to offspring on chromosomes.
Hybrid pairs of chromosomes combine to form offspring.
Codominant genes combine to form new hybrids.
What happens during meiosis?
Two sex cells combine.
Chromosome pairs separate and are distributed into new sex cells.
Each sex cell copies itself to form four new chromosomes.
Chromosome pairs remain together when new sex cells are formed.
How do caribou deal with the change in climate during winter?
They migrate.
They lose their fur.
They change their diet.
They shrink in size.
Which term refers to physical characteristics that are studied in genetics?
traits
offspring
generation
hybrids
An organism’s genotype is its
genetic makeup.
feather color
physical appearance.
stem height.
Which of the following traits is influenced by both inheritance and environmental factors?
the ability to sing well
the ability to cough
natural hair color
dyed hair color
Occurs when more than one gene affects a trait.
(a)
Occurs when only one allele is partially dominant
(a)
Three or more possible alleles determine the trait.
(a)
Occurs when allele for a trait is an X or Y chromosome
(a)
An organism’s phenotype is its allele combinations.
True
False, genotype
A hybrid is the offspring of parents that have different alleles for a trait.
True
False, same
A pea plant that is heterozygous for tall stems has the alleles Tt.
True
False, homozygous
When Mendel crossed purebred short plants with purebred tall plants, all of the offspring were short.
True
False, tall
The sex cells produced by meiosis have twice the number of chromosomes
as the parent cells.
True
False, half
