WorksheetsGenetics Review
Total questions: 45
Worksheet time: 2hrs 30mins
Prokaryotic cells do not have
A nucleus
DNA
A cell membrane
Genetic material
One advantage of asexual reproduction is that
It occurs slowly
It requires at least 2 organisms
Organisms can easily find a mate
It is fast
A complete Punnett square shows
Only the dominant alleles in parents and offspring
Genotypes and phenotypes of parents and offspring
The genotypes of the parents and offspring
The actual outcome of offspring
A dog with black fur (BB) is crossed with a dog with brown fur (bb). What is the probability that the offspring will be black?
25%
50%
75%
100%
An organism with the genotype Tt is crossed with an organism with the same genotype. What is the percentage of offspring displaying the recessive allele?
25%
50%
75%
100%
Dwarf pea plants (tt) are crossed with pea plants of regular height (TT). Which of these describes the first generation plants?
All are regular height
Half are regular height
All are dwarf height
1/4 are dwarf height
Suppose that the allele for red flower color is dominant. A plant with red flowers (homozygous) is crossed with a plant with white flowers. What is one possible phenotype and genotype of the offspring?
White flowers, Rr
Red flowers, rr
Pink flowers, rr
Red flowers, Rr
One parent has the alleles Rr for a gene. The other parent has the same alleles for that gene. What is the probability of the offspring being Rr?
25%
50%
75%
100%
Your genes are inherited from your
Alleles
Gametes
Parents
Offspring
An animal has an allele for white fur, but its fur is brown. The allele for white fur is
Not genetic
Recessive
Dominant
Incomplete
What are the chances that a human offspring will have an XX genotype?
25%
50%
75%
100%
Gregor Mendel is known as
The pea-eating monk
The papa of genes
The father of alleles
The father of genetics
What are the possible blood types of the offspring of a cross between individuals that are type Ao and type Bo?
type A or type B
Type A,B,AB, or o
only type AB
only type o
In Rhododendron, red flowers are incompletely dominant to white flowers. If two pink flowered plants were crossed, what are the chances of getting a white flower?
25%
50%
75%
100%
In Rhododendron, red flowers are incompletely dominant to white flowers. If a red flower plant and a white flower plant were crossed, what are the chances of getting a white flower?
0%
25%
50%
75%
In horses, gray hair is codominant to white hair. The heterozygous phenotype is called appaloosa (gray & white). If a gray horse were crossed with an appaloosa, what are the chances of having a appaloosa horse?
0%
25%
50%
75%
In horses, gray hair is codominant to white hair. The heterozygous phenotype is called appaloosa. If 2 appaloosas were bred, what are the chances of having a white horse?
0%
25%
50%
75%
Mom has type A blood, dad has type AB blood. What are the chances of their child having A blood?
0%
25%
50%
75%
In incomplete dominance problems, the heterozygous gene will always look like:
the dominant trait
the recessive trait
a blend of the two traits
both traits show up equally
If mom has type o blood and dad has type AB blood, what is the probability of them having a child with AB blood?
0%
25%
50%
75%
In fruit flies, the gene for white eyes is sex-linked recessive. (R) is red and (r) is white. Cross a white-eyed female with a normal red-eyed male. What percent of the offspring will have white eyes?
0%
25%
50%
75%
In fruit flies, the gene for white eyes is sex-linked recessive. (R) is red and (r) is white. Cross a heterozygous female with a white eyed male. What percent of the males will have red eyes?
0%
25%
50%
75%
In humans, hemophilia is a sex-linked recessive trait. If a female who is a carrier for hemophilia marries a male with normal blood clotting, what percent of the girl offspring will have hemophilia?
0%
25%
50%
75%
In humans, hemophilia is a sex-linked recessive trait. Cross a carrier female with a hemophiliac man. What percent of the boy offspring will inherit the disease?
0%
25%
50%
75%
What are mutations?
A change in the DNA code
An organisms with a missing part
A healthy organism
An organism with a disease
What causes mutations
A random mistake in DNA copying
Too much exposure to bad chemicals
Too much radiation
All of these
What is a genetic disorder?
A disease your develops during middle age
A disease that you inherit from your parents
A disease you develop in the womb
Any problem with your body or mind
What does it mean for a genetic disorder to be dominant?
You must inherit 2 alleles to get it
You must inherit only 1 allele to get it
Good genes will override the bad one
Only men can inherit it
What is a phenotype?
The actual genes involved
The physical appearance
The letters used
A type of genetic cross
When a trait is codominant, the heterozygous phenotype will
Be a blend of both traits
Show both traits equally
Show the dominant trait
Show the recessive trait
Which of the following disorders is a chromosomal mutation?
Huntington's disease
Achondro-plasia
Down syndrome
PKU
What can you NOT observe from a karyotype?
Missing chromosomes
Extra chromosomes
The gender
A gene mutation
Why is it important to get the right kind of blood if you need a transfusion?
Because mixing certain blood types of blood types will make the blood clot
Because mixing certain blood types cause cancer
Because mixing certain blood types will cause an explosion
It is not important
How many pairs of chromosomes do humans have?
12
23
28
46
What was the first animal clone from a somatic (body) cell?
a dog
a mouse
a sheep
a cow
Why have we not cloned a human yet?
It wouldn’t work
We don’t know how
Human cloning has been banned
A human clone would not be able to survive
What is a gene?
A type of pants
A section of DNA that codes for a trait
2 DNA molecules wrapped in protein
A physical trait
What is CRISPR?
A technique for making food taste fresher
A way to clone animals
A technique for cutting and inserting DNA
A cancer treatment
Why are sex-linked traits more common in males?
The traits are on the Y chromosome only
The traits are on the X chromosome and males have only 1 chance at a good allele
The traits never develop in girls
No one knows
What is selective breeding?
When the female decides when to breed
When the male decides when to breed
When humans select which animals/plants to breed
When an organism refuses to breed
What does it mean for an allele to be dominant?
The dominant trait is able to mask the recessive
The recessive allele is able to mask the dominant
The trait will always show up
You must receive 2 dominant alleles for the trait to show
What does it mean for alleles to be heterozygous?
The alleles are the same
The alleles are different
The alleles will blend
Both alleles show up
One advantage to sexual reproduction is
The offspring are identical
The offspring are unique and varied
It is faster than other forms of reproduction
It requires less energy than other forms of reproduction
What does it mean for a disorder to be autosomal?
All humans will automatically get this disorder
This disorder affects the first 22 chromosomes
This disorder affects the 23rd pair of chromosomes
This disorder is carried in the genes but never expressed
What disorder is shown in this karyotype?
There's no way to tell
Klinefelter's Syndrome
Down Syndrome
Turner's Syndrome
