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WorksheetsBMAT 15.02.2019
Total questions: 14
Worksheet time: 11mins
Q1. (B8(1)) If two heterozygous, phenotypically tall plants with a recessive gene
for height are cross-pollinated, what will be the ratio of tall plants to short in the
offspring?
1:1
1:2
2:1
3:1
4:1
(B8(3)) If A = dominant abnormal trait, a = recessive normal trait, B = dominant
normal trait and b = recessive abnormal trait, then what genotypes are expressed in
the following pedigree?
Autosomal recessive (25% of the children of unaffected parents (heterozygous) will express the recessive trait (homozygous))
aa, Bb
Bb, bb
Bb, Bb
BB, Bb
(B8(3)) If A = dominant abnormal trait, a = recessive normal trait, B = dominant
normal trait and b = recessive abnormal trait, then what genotypes are expressed in
the following pedigree?
AA, Aa, aa
AA, aa
Aa, Aa
AA, aa, bb
(B5c,d) In the menstrual cycle, which hormone peaks to trigger ovulation and
which hormone peaks after ovulation has taken place?
Oestrogen followed by progesterone.
Follicle-stimulating hormone followed by progesterone.
Luteinizing hormone followed by progesterone.
Follicle-stimulating hormone followed by luteinizing hormone.
Luteinizing hormone followed by oestrogen.
(B1) Most of the chemical digestion of carbohydrates, protein and fats takes place
in which part of the gastro-intestinal tract catalysed by enzymes released by which
gland(s)?
Stomach and thyroid gland.
Stomach and pancreas gland.
Duodenum and adrenal glands.
Small intestine and pancreas gland.
Small intestine and pituitary gland.
(B8(1)) In the Punnett square shown below, ‘A’ is the dominant allele and ‘a’ is
the recessive allele. How many genotypes are there and how many phenotypes are
there?
2 genotypes and 2 phenotypes.
3 genotypes and 2 phenotypes.
2 genotypes and 3 phenotypes.
3 genotypes and 3 phenotypes.
3 genotypes and 4 phenotypes.
Red blood cells (RBCs) in the pulmonary artery contain:
Less carbon dioxide than RBCs in the pulmonary vein and no oxygen.
Less oxygen than RBCs in the pulmonary vein and no carbon dioxide.
Less oxygen and less carbon dioxide than RBCs in the pulmonary vein.
More oxygen and more carbon dioxide than RBCs in the pulmonary vein.
Less oxygen and more carbon dioxide than RBCs in the pulmonary vein.
Which of the following substances are not found in the glomerular filtrate of
a healthy kidney nephron?
1: urea; 2: glucose; 3: protein; 4: water; 5: sodium; 6: red blood cells.
1, 2, 4 and 5
2, 4 and 5
3 and 6
1 and 3
2, 3 and 6
The kidneys are important organs responsible for maintaining
the homeostatic balance of body fluids. How do the kidneys
maintain blood pressure?
By controlling the amount of ions such as sodium
reabsorbed
By regulating the amount of water reabsorbed into the
blood
By releasingADH
By removing waste products from the body
Byremoving potassium from the blood
Cystic fibrosis is a genetic disease which causes an excess of
mucus to be produced in the lungs. It is caused by a faulty gene
which is recessive. Study the family tree below. Which family
members are definitely carriers of the faulty gene?
3+4+6+7
3+4+6
3+4+6+7+8
either 1 or 2 and either 3 or 4 + 6
either 1 or 2 and 3 + 4 + 6
Enzymes are biological catalysts which occur naturally in our
bodies. Which of the following statements about enzymes are
true:
A They are sensitive to temperature and pH
B They are used in the cheese making industry
C The higher the temperature, the quicker they work
D They increase the activation energy of a reaction
E They are used in washing powder
A
A and B
A, B, E
C,D
C
A
The nicotine the cigarettes contain stops the heart from
working properly
Carbon monoxide released by the cigarettes reduces the
amount of oxygen the red blood cells can transport to
tissues
It raises blood cholesterol and blood pressure which can
lead to arteriosclerosis
It prevents people exercising. This may lead to obesity
which is a risk factor for CHD
Tar builds up in the arteries, reducing the flow of blood to
the heart
A
B
C
D
E
Molecular cloning is used in medicine to create identical copies
of a DNA sequence. Which of the following is not an application
or form of cloning?
Repopulation of endangered species
Creating genetically modified crops
Asexual reproduction
Generating new tissues and organs for transplants
IVF
