Genetics QMP Flashcards
A gene is
A section of DNA
A part of the cell nucleus with the specific role of housing DNA
A single strand of DNA
A spherical protein holding a chomosome together
A protein holding DNA together
A section of DNA
What kind of age are the majority of women who develop breast cancer?
18-30
40-55
25-40
13-18
75 upwards
40-55
Which one of the following is a description of the defects associated with Down’s?
The failure of the chromosomes to seperate at anaphase in meiosis
The loss or damage of genes during the strand folding process
The placement of genes in the wrong sequence/upside down in the chrosmosome
The duplication of nitrogeneous bases
The movement of a gene from one chromitid to a non-homologous chromatid
The failure of the chromosomes to seperate at anaphase in meiosis
A student notices that the left hand column on a pedigree diagram has the term F2. What does this means?
The second child
The next generation
The offspring of the original parents
The probability of inheritance is twice as likely
This row of offspring represent the grandchildren of the original parents
This row of offspring represent the grandchildren of the original parents
A nucleotide is made up of a
sugar, a nitrogen base and ATP
sugar, a phosphate and a nitrogen base
base, a phosphate and a nitrogen atom
hydrogen bond, a phosphate ansds ATP
sugar, a sodium atom and a base
sugar, a phosphate and a nitrogen base
A gamete is
a reproductive organ
a newly fertilized ovumn
an eraly embryo with a yolk sac
a cell that results from meiosis
a cell that results from mitosis
a cell that results from meiosis
Which one of these chromosomal mutations is responsible for creating the extra chromosomal anomaly associated with Down’s syndronme?
Sequence duplication
Inversion
Non-disjunction
Deletion
Translocation
Non-disjunction
What is the mode of inheritance that gives rise to haemophilia?
Recessive autosomal
Sex linked recessive on the Y chromosome
Sex linked dominant
Dominant autosomal
Sex linked recessive on the X chromosome
Sex linked recessive on the X chromosome
Some SRY gene failures on the Y chromosome can lead to
No puberty occurs with these individuals
Is incompatible with life and the individual dies during gestation or soon after birth
Ambigious genitalia looking vaguely female at birth but not a true female
Infants slow to thrive
Chromosomal mutations that produce multiple birth defects
Ambigious genitalia looking vaguely female at birth but not a true female
Cystic fibrosis is a disease that prevents the correct enzymes being formed in tissues that require the use of mucus of the correct consistency. The disease is autosomal recessive. Both parents are carriers which of the following represents the proibability of their children having the disease.
50%
25%
60%
100%
0%
25%
If you know the genotypes for a mother and father and they turn out to be that of a heterozygote and a homozygote which ratio/proportion best expresses the likely outcome of genotypes?
1:2:1
50%
30%
100
3:1
50%
A single chromosome has
Two chromatids and one histone
One chomatid and two centrmeres
Two chromatids and one centromere
Two chromatids and two centromeres
Four chromatids and two centromeres
Two chromatids and one centromere
Which of the following is NOT a diploid cell?
A myocyte
A lymphocyte
An ovum
A hepatocyte
A osteocyte
An ovum
Why are women encouraged to self-examine the axilla (arm pit) atrea in addition to the breast itself?
The fat cells that make up the bulk of the breast can move to the axilla during abnormal tissue proliferation
The action of axilla examination ensures the individual covers all aspects of breast tissue
The tenmdons on the pectoral muscles are particularly prone to neoplastic spread
Breast cancer cells can infiltrate the lymph nodes in the axilla relitively rapidly
Breast lactiferous tubules extend to the axilla
Breast cancer cells can infiltrate the lymph nodes in the axilla relitively rapidly
The pedigree diagram notation shows a carrier as
a block colour square
a half colour circle or square
a square
a block colour circle
a circle
a half colour circle or square
