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Genetics Review
Test Description: Review of Punnett Squares, Pedigrees, Genetics Disorders, and Vocabulary Terms
Instructions: Answer all questions to get your test result.
1) When sex cells combine to produce offspring, each sex cell will contribute
A
the normal number of chromosomes
B
one fourth the number of chromosomes
C
half the number of chromosomes
2) An allele in which a trait always shows up when the allele is present is called
A
codominant
B
incomplete dominance
C
dominant
D
recessive
3) Chromosomes are made up of
A
RNA
B
cells
C
many traits joined together
D
many genes joined together
4) What does the notation Bb mean to geneticists?
A
homozygous alleles
B
one dominant and one recessive allele
C
two dominant alleles
D
two recessive alleles
5) An organism's physical appearance is its
A
heterozygous
B
genotype
C
homozygous
D
phenotype
6) What is a mutation?
A
any change that is harmful to an organism
B
any change that is helpful to an organism
C
any change in a gene or a chromosome
7) Why are sex-linked traits more common in males than in females?
A
A recessive allele on the X chromosome will always produce the trait in a male
B
All alleles on the X chromosome are dominant
C
All alleles on the Y chromosome are recessive
8) A purebred chicken with white feathers is crossed with purebred chicken that has black feathers. Each of their offspring have both black and white feathers. Why does this happen?
A
Several alleles work together to determine the trait
B
The alleles are both dominant
C
The alleles are an example of incomplete dominance
D
The alleles are both recessive
9) Genetic disorders are caused by
A
pedigrees
B
recessive alleles only
C
dominant alleles only
D
DNA mutations or changes in chromosomes
10) A carrier is a person who has
A
two unknown alleles
B
one dominant allele and one recessive allele for a trait
C
two recessive alleles
D
two dominant alleles for a trait
11) An organism with two identical alleles for a trait is called a(n)
A
hybrid
B
phenotype
C
purebred
D
heterozygous
12) Which combination of sex chromosomes results in a male human being?
A
XY
B
either XX or YY
C
XX
D
YY
13) What is a pedigree?
A
a chart that tracks which members of a family have a particular trait
B
a picture of all the chromosomes within a cell
C
A tool used to show genotypes and phenotypes of future offspring
D
a geneticist who studies the inheritance of traits in humans
14) Factors that control traits are called
A
purebred
B
genes
C
alleles
D
hybrid
15) The passing of physical characteristics from parents to offspring is known as
A
genes
B
heredity
C
chromosomes
D
genetics
16) An organism's genotype is its
A
genetic makeup
B
trait
C
feather color
D
physical appearance
17) Many characteristics are affected by interactions between genes and
A
carriers
B
the environment
C
alleles
D
pedigrees
18) A mutation can be...
A
Neutral
B
Helpful
C
Harmful
D
All of the above
*select an answer for all questions
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