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Genetics - 3.1-3.3 + Nucleotides
By Deborah Dale
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Last updated over 5 years ago
17 questions
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16.
SL/HL - Outline how the process of meiosis can lead to Down's syndrome.
5
marks
Question 17
17.
HL - Describe the consequences of a base substitution mutation with regards to sickle cell anemia.
7 marks
Short wings in fruit flies is:
The genotype
The phenotype
Determined by the genotype
Affected by the environment
All except A the genotype
In this image of the human karyotype:
There are 46 pairs of chromosomes
The DNA has already been replicated
None are true.
There are 23 pairs of autosomes
The sister chromatids have separated
In a nucleosome, what is the DNA wrapped around?
mRNA
Nucleolus protein.
Polymerase molecules.
Ribosomes.
Histones
During meiosis, metaphase I has ____________ amount of genetic material than a normal body cell undergoing no chromosome activity.
a quarter the
half the
the same
quadruple the
double the
Sister chromatids begin to move apart in animal cells during:
prophase II
interphase
anaphase II
telophase I
anaphase I
An allele is
Another word for a gene
A variant of a gene
Only comes in pairs
Another word for a locus
A type of chromosome
Which of the following statements is false?
Humans have 46 chromosomes
Humans have 23 pairs of chromosomes
Humans have 1 pair of sex chromosomes
Humans have 22 autosomes
Sex chromosomes are considered a homologous pair
HL - What kind of meiotic non-disjunction can lead to an XXY son?
Non-disjunction at meiosis I in the formation of sperm
Non-disjunction at meiosis I in the formation of eggs
Non-disjunction at meiosis II of the Y chromosome in the formation of sperm
All except non-disjunction at meiosis II of the Y chromosome in the formation of sperm
Non-disjunction at meiosis II in the formation of eggs.
Nucleotides are:
the building-blocks of protein
made of a ribose, a phosphate, and a base and are basic in nature
the building-blocks of the cell
made of a ribose, a phosphate, and a base and are acidic in nature
made of a ribose, a sulfate, and a base
Which statement about DNA bases is true?
Thymine and adenine are pyrimidines.
Guanine and cytosine are purines.
None are correct
Guanine and cytosine are pyrimidines.
Adenine and guanine are purines.
Which statement about RNA is true?
It has one less oxygen in its ribose.
Thymine is one of its nitrogenous bases.
It is a double-stranded molecule.
None are true.
Uracil is one of its nitrogenous bases.
According to Chargaff’s rules for DNA base composition, if a DNA sample contained 10%
guanine, the sample should have:
10% adenine
40% thymine
40% cytosine
90% cytosine
None are true
Which of the following could cause DNA mutations
sulfuric acid and UV rays
UV rays and bruises
cuts to the skin and bruises
ionizing radiation and UV rays
ionizing radiation and cuts to the skin
Types of mutation include
none are correct
insertion, substitution, multiplication
deletion, insertion, sutraction
division, addition, insertion
substitution, deletion, insertion
One half of a DNA strand has the following sequence of bases GCTACGGCGTTATCCCC.
What would appear on the other half?
CGATGCCGCAATAGGGG
CGATTCCGCAATAGGGG
ATAGGAATACCGCTTTT
GCTAAGGCGTTATCCCC
TATCCTTATGGCGAAAA