Q.1
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
0 h : 0 m : 1 s