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WorksheetsGenes, Chromosomes and Genome
Total questions: 18
Worksheet time: 10mins
Which of the following definitions best describes an allele?
A particular form of a gene which biologists wish to express in an experiment.
The particular section of DNA responsible for the production of autosomes.
A particular form of a gene with a unique nucleotide sequence.
What is the name of the part labelled V
homologous chromosomes
sister chromatids
centromere
replication
gene loci
What is the name of the part labelled U
homologous chromosomes
sister chromatids
centromere
replication
gene loci
What is the name of the part labelled W
homologous chromosomes
sister chromatids
centromere
replication
gene loci
What is the name of the part labelled Z
homologous chromosomes
sister chromatids
centromere
replication
gene loci
What is the name of the part labelled X
homologous chromosomes
sister chromatids
centromere
replication
gene loci
Which of the following options correctly describes what is being shown in the following karyotype?
female with trisomy
male with tetrasomy
male with no visible mutations
female with no visible mutations
This Karyotype indicates that the person has
Klinefelter syndrome
Down Syndrome
Tetrasomy X
Polyploidy
The complementary sequence of CAT GAC AGA ACC is
CAT GAC AGA ACCC
GTA CTG TCT TGG
GTA CTG TCT TGA
CTA CTG TCT TGG
The term ‘position 11.3’ refers to which of the following?
Gene loci
Typical Allele
Chromosome
Nucleotide Sequence
Turner Syndrome is a
trisomy (2n+1)
tetrasomy (2n+2)
monosomy (2n-1)
polyploidy (2n+n)
A person with delayed physical growth, possible heart defects, flattened facial profile, mild to
moderate intellectual disability has
Klinefelter syndrome
Turner Syndrome
Down Syndrome
Tetrasomy X
People with Tetrasomy X have
two extra copies of the X chromosome
one less x chromosome
two X chromosomes and two Y chromosomes
two copies of chromosome 21
Polyploidy refers to a chromosomal abnormality
in which an organism has more than two sets of each chromosome.
in which an organism has more than two copies of each chromosome.
Which of the following correctly summarises the distinction between an organism’s genotype and their phenotype?
genotype refers to the alleles that an organism has inherited for a particular gene, while phenotype refers to all of an
organism’s observable traits
genotype refers to any observable characteristics arising from an organism’s genome, while phenotype refers to the
expression of traits based on the environment
A homozygous plant with red petals (AA) mates with another homozygous plant with white petals (aa) and produces an offspring with pink petals. Based on this information, which type of dominance do the alleles for petal colour display?
Codominance
Incomplete Dominance
Complete Dominance
A homozygous plant with red petals (AA) mates with another homozygous plant with white petals (aa) and produces an offspring with both red and white petals. Based on this information, which type of dominance do the alleles for petal colour display?
Codominance
Incomplete Dominance
Complete Dominance
Which of the following is not true of sex-linked genes?
There are more genes on the X chromosome than on the Y chromosome.
If a male inherits a recessive allele on his X chromosome it will not be expressed in his phenotype
X-linked traits are less likely to be expressed in females than they are in males, as females have two copies of the X chromosome.
If a male carries an allele for a particular disease on his X chromosome, he will only be able to pass on that abnormal
X-linked trait to his daughters.
