WorksheetsWSH IB SL 3.1 + 3.2 preview
Total questions: 25
Worksheet time: 12mins
What distinguishes an allele from a gene?
An allele is made of RNA.
An allele is shorter.
An allele is a variety of a gene.
An allele cannot be transferred during genetic modification.
What is the effect of dominant alleles?
I. They mask the effect of recessive alleles.
II. They become more frequent than recessive alleles in a population.
III. They have a joint effect with recessive alleles when characteristics are co-dominant.
I only
I and II only
I and III only
I, II and III
What is the composition of eukaryotic chromosomes?
DNA only
DNA and ribose
DNA and RNA
DNA and proteins
What is the name given to a heritable factor which controls a specific characteristic?
Allele
Chromosome
Gene
Mutation
What is a gene mutation?
Failure of chromosome pairs to separate properly during cell division
Changes to genes caused by natural selection
Changes to the nucleotide sequence of the genetic material
Changes in karyotypes
What is the difference between the alleles of a gene?
Their position on the chromosome
Their amino acid sequence
Their pentose sugars
Their base sequence
Which of the following statements about homologous chromosomes is correct?
Each gene is at the same locus on both chromosomes.
They are two identical copies of a parent chromosome which are attached to one another at the centromere.
They always produce identical phenotypes.
They are chromosomes that have identical genes and alleles.
What are homologous chromosomes?
Identical chromosomes
Non-identical chromosomes with different genes
Non-identical chromosomes with the same genes in the same sequence but not necessarily the same alleles
Non-identical chromosomes with the same genes in a different sequence and not necessarily the same alleles
What is the set of alleles that an individual possesses?
A gene
A genotype
A genome
A genus
What is an individual's genome?
An organism's complete set of genetic information
Only an organism's chromosomes
The average position of each gene for a species
How much of a human's genome is shared with another human
~60%
~99%
~75%
~90%
Where do somatic mutations occur?
In the cells of the body
In the germline
What defines a germline mutation?
The gene it affects
The allele it gives rise to
That it might be passed onto offspring
That it causes a biological sex change
Sickle cell anemia may be an example of what when taken in context of malaria?
An exacerbating condition
A heterozygous advantage
It has no effect
No direct connection, but exacerbates
Which of the following are examples of substitution mutations? Check all that apply
Silent
Missense
Nonsense
Insertions
Deletions
Which of the following are examples of frameshift mutations? Check all that apply
Silent
Missense
Nonsense
Insertions
Deletions
What term would you use to describe the location of a gene on a chromosome?
Allele
Sequence
Locus
Site
What is the molecular action of sickle cell anemia?
The alteration of hemoglobin
The production of insoluble fibers
Crosslinking of the cell membrane
Substitution of iron core of hemoglobin
How many chromosomes does a human have?
23
46
44
22
How many chromosomes does a haploid cell have?
2n
n
4n
1/2n
How could you tell that a karyotype was potentially taken from a biological male human? (referring only to biological sex)
Staining for the SRY gene
PCR of the SRY gene
The presence of a Y chromosome
The absence of a second X chromosome
What's a plasmid?
A circular construct of DNA found in all cells
A circular construct of DNA found in prokaryotes only
A circular construct of DNA found in mitochondria
A circular construct of DNA found in eukaryotes only
You would be able to identify a patient with Down's syndrome with a karyogram by:
Half the number of chromosome 21
An extra 21st chromosome
A complete absence of the 21st chromosome
4 complete 21st chromosomes
What are two symptoms of sickle cell anemia?
Fatigue
Blood clotting
Excessive bleeding
Difficulty breathing
An autosome is:
Any chromosome that is not a sex chromosome
All chromosomes passed onto offspring
A specialized type of sex chromosome
The arrangement of chromatin found in gametes
