Chromosomes that do not determine the sex of an individual
autosomes
sex chromosomes
gametes
chromatids
Q.2.
A heterozygous organism has
three different alleles for a trait.
two identical alleles for a trait.
only one allele for a trait.
two different alleles for a trait.
Q.3.
What does the notation Tt mean to geneticists?
two dominant alleles
one dominant and one recessive allele
homozygous alleles
two recessive alleles
Q.4.
What is the probability of producing a tall pea plant from a genetic cross between two hybrid tall pea plants?
one in four
two in four
three in four
four in four
Q.5.
What does a Punnett square show?
all of Mendel’s discoveries about genetic crosses
only the recessive alleles in a genetic cross
only the dominant alleles in a genetic cross
all the possible outcomes of a genetic cross
Q.6.
Which term refers to physical characteristics that are studied in genetics?
offspring
traits
generations
hybrids
Q.7.
Factors that control traits are called
parents
genes
purebreds
recessives
Q.8.
Scientists call an organism that has two different alleles for a trait a
dominant
purebred
factor
hybrid
Q.9.
What is probability?
the number of times a coin lands heads up
the actual results from a series of events
the way the results of one event affect the next event
a number that describes how likely it is that an event will occur
Q.10.
If a homozygous black guinea pig (BB) is crossed with a homozygous white guinea pig (bb), what is the probability that an offspring will have black fur?
25%
50%
75%
100%
Q.11.
An organism’s physical appearance is its
dominance
genotype
phenotype
allele
Q.12.
When sex cells combine to produce offspring, each sex cell will contribute
twice the number of chromosomes in body cells.
the normal number of chromosomes in body cells.
half the number of chromosomes in body cells.
one fourth the number of chromosomes in body cells.
Q.13.
The different forms of a gene are called
factors
alleles
masks
traits
Q.14.
A nondisjunction resulting in three chromosomes in one position is called
monosomy
disomy
trisomy
polysomy
Q.15.
An organism that has two identical alleles for a trait is
homozygous
heterozygous
a phenotype
tall
Q.16.
The position of a gene on a chromosomes is the _______.
allele
gene locus
Q.17.
Which statement is NOT true about Karyotypes
Chromosomes (pairs 1-22) are arranged by size
Sex chromosomes are found at the end
A normal karyotype has 46 chromosomes or 23 pairs
Having missing or extra chromosomes does not indicate a disorder
Q.18.
An abnormality in which homologous chromosomes fail to separate properly is called
glue syndrome
sticky-osis
nondisjunction
telophase
Q.19.
A nondisjunction resulting in one chromosome in one position is called
monosomy
disomy
trisomy
polysomy
Q.20.
If a gene is found only on the X chromosome and not the Y chromosome, it is said to be what?
sex-linked trait
polygenic trait
codominant trait
incomplete dominance trait
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