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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
half the number of chromosomes
B
one fourth the number of chromosomes
C
the normal number of chromosomes
2) An allele in which a trait always shows up when the allele is present is called
A
dominant
B
codominant
C
incomplete dominance
D
recessive
3) Chromosomes are made up of
A
cells
B
many genes joined together
C
RNA
D
many traits joined together
4) What does the notation Bb mean to geneticists?
A
two recessive alleles
B
homozygous alleles
C
two dominant alleles
D
one dominant and one recessive allele
5) An organism's physical appearance is its
A
genotype
B
homozygous
C
phenotype
D
heterozygous
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
All alleles on the X chromosome are dominant
B
All alleles on the Y chromosome are recessive
C
A recessive allele on the X chromosome will always produce the trait in a male
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
The alleles are both dominant
B
The alleles are an example of incomplete dominance
C
Several alleles work together to determine the trait
D
The alleles are both recessive
9) Genetic disorders are caused by
A
pedigrees
B
DNA mutations or changes in chromosomes
C
dominant alleles only
D
recessive alleles only
10) A carrier is a person who has
A
two unknown alleles
B
two recessive alleles
C
two dominant alleles for a trait
D
one dominant allele and one recessive allele for a trait
11) An organism with two identical alleles for a trait is called a(n)
A
heterozygous
B
hybrid
C
phenotype
D
purebred
12) Which combination of sex chromosomes results in a male human being?
A
YY
B
XY
C
XX
D
either XX or YY
13) What is a pedigree?
A
a geneticist who studies the inheritance of traits in humans
B
a chart that tracks which members of a family have a particular trait
C
a picture of all the chromosomes within a cell
D
A tool used to show genotypes and phenotypes of future offspring
14) Factors that control traits are called
A
hybrid
B
purebred
C
genes
D
alleles
15) The passing of physical characteristics from parents to offspring is known as
A
genes
B
genetics
C
chromosomes
D
heredity
16) An organism's genotype is its
A
genetic makeup
B
feather color
C
trait
D
physical appearance
17) Many characteristics are affected by interactions between genes and
A
carriers
B
alleles
C
pedigrees
D
the environment
18) A mutation can be...
A
Harmful
B
Helpful
C
All of the above
D
Neutral
*select an answer for all questions
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