WorksheetsGenetics Unit
Total questions: 50
Worksheet time: 25mins
Which of the following is NOT influenced by the environment?
skin cancer
eye color
lung cancer
obesity
Which of these choices plays a huge role and can have an effect on your existing genetic factors?
your diet
what you wore today
doing science homework
your hair color
Which of these traits is purely a genetic trait?
athleticism
blood type
whistling ability
height
The definition of an environmental trait is:
a trait that is only available on Earth Day
a trait that is passed down by an organism’s biological parents, through DNA
a trait that is developed when you are in a forest, or jungle
a trait that is developed by an organism’s surroundings
Which best explains why sexual reproduction produces greater variations in the offspring?
The DNA comes from two genetically different parents.
The DNA comes from one parent that is genetically identical.
The sex cells are produced by mitosis.
The sex cells undergo self-fertilization
Single celled organisms can reproduce and create cells exactly like themselves without combining genes from two different parent cells. When they do this, they use a type of
asexual reproduction
gamete formation
natural selection
sexual reproduction
Many plants reproduce asexually. How does the genetic material (DNA) compare between the new plant and the parent plant in this type of reproduction?
It is similar but not identical
It depends on the plant the parent was crossed with
It depends on the climate it is grown in
It is identical
Reproduction by 2 parents that produce genetically DIFFERENT offspring is called
Sexual reproduction
Asexual reproduction
Fertilization
Spontaneous generation
Which of the following statements is part of the cell theory?
Only plants are made of cells
All cells come from other cells
Cells can be produced from nonliving matter
Only animals are made of cells
According to the cell theory what is the basic structure and function of all life?
nucleus
mitochondria
organelles
cells
Color blindness is a sex linked trait carried on the X chromosome. Who can be affected by color blindness?
Both males and females, but males are more likely
Both males and females, but females are more likely
Males only
Females only
Sex linked genes are genes on
The X chromosome only
The Y chromosome only
The X and Y chromosome
All 23 pairs of chromosome
A father does not have hemophilia (XHY), but the mother is a carrier (XHXh). Hemophilia is a recessive sex-linked trait carried on the X chromosome. What is the probability of having a child with hemophilia?
0%
25%
50%
100%
Down Syndrome most often occurs when
A person inherits a recessive allele
Chromosomes fail to separate during meiosis, causing 3 copies of chromosome 21
Sickle-shaped cells become stuck in blood vessels
Blood fails to clot properly
What genetic disorder results in abnormally shaped blood cells?
Hemophilia
Down syndrome
Cystic fibrosis
Sickle-cell disease
What genetic disorder occurs when blood is thin and does not clot properly?
Hemophilia
Down syndrome
Cystic Fibrosis
Sickle Cell Disease
What is the possible genotype for the individual at I-1?
HH
hh
Hh
What is the possible genotype for the person at II-2?
HH
hh
Hh
What is the genotype of person II-3?
AA
aa
Aa
What is the genotype for the person at II-1?
HH
hh
Hh
HH or Hh
How are individuals I-1 and I-2 related?
married
aunt or nephew
mother and son
brother and sister
Mitosis occurs in...
sex cell and produces 4 daughter cells
body cells and produces 2 identical daughter cells
body cells and produces 2 genetically different daughter cells
sex cells produces 2 daughter cells
A type of reproduction that occurs in the sex cells and results in 4 daughter cells each with HALF the chromosomes of the parent cell.
Meiosis
Mitosis
Regeneration
Budding
If the parent cell starts out with 46 chromosomes and undergoes mitosis, then how many will each of the daughter cells have at the end of mitosis?
46
12
5
23
In meiosis if the parent cell has 46 chromosomes, then how many will each of the daughter cells have at the end of meiosis?
46
10
23
18
Meiosis occurs in which of the following?
plant cells
animal cells
sex cells
skin cells
What is the probability the offspring will be homozygous dominant?
25%
50%
75%
100%
What is the probability the offspring will be homozygous recessive?
25%
50%
75%
100%
What is the probability the offspring will be a heterozygous?
25%
50%
75%
100%
In Squidward’s family, blue skin is dominant to green skin. If Squidward is homozygous dominant and he marries someone who is heterozygous for blue skin what is the probability of having offspring with green skin?
0%
25%
50%
100%
In rabbits white fur is dominant to brown fur. If both the mother and father rabbit are heterozygous, what is the probability of having brown fur babies?
0%
25%
75%
100%
Factors that control traits are called:
Purebreds
Recessives
Parents
Genes
What does Tt mean to genetics?
Two dominant alleles
Two recessive alleles
Homozygous alleles
One dominant allele and one recessive allele
If an organism has a visible trait that is it’s
Homotype
Phenotype
Heterotype
Genotype
What does a homozygous recessive allele combination look like?
AA
Aa
aa
XY
What does a homozygous dominant allele combination look like?
AA
Aa
aa
XY
What does a heterozygous allele combination look like?
AA
Aa
aa
XY
A carrier is a person who has
One recessive and one dominant allele for a trait
Two recessive alleles for a trait
Two dominant alleles for a trait
More than two alleles for a trait
Many characteristics are affected by interactions between genes and
punnett squares
alleles
the environment
carriers
If a homozygous black guinea pig (BB) is crossed with a homozygous white guinea pig (bb), what is the probability that the offspring will have black fur?
25%
50%
75%
100%
What is the probability of producing a tall pea plant from a genetic cross of two heterozygous parents? (T= tall, t=short)
25%
50%
75%
100%
How does a geneticist use pedigrees?
To create genetic crosses
To replicate identical strings of DNA
To prove that sex linked traits are caused by co-dominant alleles
To trace the inheritance of traits in humans
Genetic disorders are caused by:
Dominant alleles
Recessive alleles
Changes in chromosomes (additions/deletions/swaps in base pairs)
All of the above
When a male is affected by a sex-linked trait on the X chromosome, where did he inherit that disorder from?
mom
dad
grandmother
grandfather
When a male is affected by a sex-linked trait on the Y chromosome, where did he inherit that disorder from?
mom
dad
grandmother
grandfather
What does a non-shaded circle mean on a pedigree?
affected male
non-affected male
affected female
non-affected female
What does a shaded square mean?
affected male
non-affected male
affected female
non-affected female
What does a shaded circle mean?
affected male
non-affected male
affected female
non-affected female
What does a non-shaded square mean?
affected male
non-affected male
affected female
non-affected female
How many offspring did generation 2 have?
1
2
3
6
