a) Colour blindness; haemophilia;
Sickle cell anaemia;
b) Part of X chromosome has homologous portion on the Y chromosome therefore if the X has
the recessive trait, it will show on the male phenotype ;
c) The son inherits the X chromosome from the mother while the daughter inherits the
X chromosome from the father;
Kavungya answered the question on June 17, 2019 at 07:34
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Wekesa and Wanjiku who are siblings are both normal as their parents but have a hemophilic
brother. Give the Genotype of their parents.
(Solved)
Wekesa and Wanjiku who are siblings are both normal as their parents but have a hemophilic
brother. Give the Genotype of their parents.
Date posted:
June 17, 2019
.
Answers (1)
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A DNA stand has the following base sequence: GCCTAGATCAC What is the sequence of the :
(i) Complementary DNA strand?
(ii) M-RNA strand coped form this...
(Solved)
A DNA stand has the following base sequence: GCCTAGATCAC What is the sequence of the :
(i) Complementary DNA strand?
(ii) M-RNA strand coped form this DNA strand
Date posted:
June 17, 2019
.
Answers (1)
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Identify the type of gene mutations represented by the following pairs of words:-
(i) Shirt instead of skirt
(ii) Hopping instead of shopping
(iii) Eat instead of tea
(Solved)
Identify the type of gene mutations represented by the following pairs of words:-
(i) Shirt instead of skirt
(ii) Hopping instead of shopping
(iii) Eat instead of tea
Date posted:
June 17, 2019
.
Answers (1)
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Members of the same species of organism tend to differ due to variation. State three causes of
variation in organisms
(Solved)
Members of the same species of organism tend to differ due to variation. State three causes of
variation in organisms
Date posted:
June 17, 2019
.
Answers (1)
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Part of one strand of a DNA molecule was found to have the following base sequence.
G – T – C – A – G –...
(Solved)
Part of one strand of a DNA molecule was found to have the following base sequence.
G – T – C – A – G – T
(a) What is the sequence on m-RNA strand copied from this DNA portion?
(b) State two roles of DNA molecule.
Date posted:
June 17, 2019
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Answers (1)
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State three mechanisms that prevent self pollination in a flower that has both male and female
Parts.
(Solved)
State three mechanisms that prevent self pollination in a flower that has both male and female
Parts.
Date posted:
June 17, 2019
.
Answers (1)
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A woman with blood group A gave birth to twins both having blood group AB.
Determine the genotype of:
a) Father
b) Mother
(Solved)
A woman with blood group A gave birth to twins both having blood group AB.
Determine the genotype of:
a) Father
b) Mother
Date posted:
June 17, 2019
.
Answers (1)
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The flow diagram below represents blood clotting process
Name the proteins represented by the letters; V, Y, Z
(Solved)
The flow diagram below represents blood clotting process
Name the proteins represented by the letters; V, Y, Z
Date posted:
June 17, 2019
.
Answers (1)
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How does an Endotherm respond to both heat gain and heat loss?
(Solved)
How does an Endotherm respond to both heat gain and heat loss?
Date posted:
June 17, 2019
.
Answers (1)
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Describe the path taken by urea from the organ where it is formed until it is released from
the human body
(Solved)
Describe the path taken by urea from the organ where it is formed until it is released from
the human body
Date posted:
June 17, 2019
.
Answers (1)
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In an investigation, two persons A and B drunk the same amount of glucose solution. Their blood
sugar levels were determined immediately and thereafter at intervals...
(Solved)
In an investigation, two persons A and B drunk the same amount of glucose solution. Their blood
sugar levels were determined immediately and thereafter at intervals of one hour for the next six
hours.
The results were as shown in the following table
(a) Explain each of the following observations;-
(i) Blood sugar level increased in person A between 0 and 1 hour
(ii) The blood sugar level dropped in person A between 1 and 4 hours
(b) From the graph, what is the normal blood glucose sugar level for human beings
(c) Suggest a reason for the high sugar level in person B
(d) How can the high blood sugar level in person B controlled?
(e) What is the biological significance of maintaining a relatively constant sugar level in a human
being
(f) Account for the decrease in the blood glucose level of person B after 4 hours
Date posted:
June 17, 2019
.
Answers (1)
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Study the diagram below and answer the questions that follow
(a) Name the structure represented by the diagram
(b) (i) Name the parts labelled D and M
(ii)...
(Solved)
Study the diagram below and answer the questions that follow
(a) Name the structure represented by the diagram
(b) (i) Name the parts labelled D and M
(ii) Name the hormones whose sites of action are Q and G (c) Name one substance that is present in part N but absent in part Z
(d) The contents of part V were boiled with Benedicts’ solution and an orange precipitate was
formed. Account for the results
Date posted:
June 17, 2019
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Answers (1)
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Explain the significance of the flow system in the nephron where the glomerular filtrate
flows in opposite direction to that of blood in the surrounding capillaries
(Solved)
Explain the significance of the flow system in the nephron where the glomerular filtrate
flows in opposite direction to that of blood in the surrounding capillaries
Date posted:
June 17, 2019
.
Answers (1)
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Kosgei and Onyancha collided during a football match and each got bruised. Kosgei’s bruise stopped bleeding after ten minutes while Onyancha’s bruise continued bleeding and...
(Solved)
Kosgei and Onyancha collided during a football match and each got bruised. Kosgei’s bruise stopped bleeding after ten minutes while Onyancha’s bruise continued bleeding and he had
to be taken to hospital for treatment.
(a) Explain the process which brought about stoppage of Kosgei’s bleeding
(b) Distinguish between blood clotting and haemagglutination.
(c) Name the disease, that Onyancha could be suffering from.
Date posted:
June 17, 2019
.
Answers (1)
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The equation below represents a metabolic process that occurs in a certain organ in the m
mammalian body:-
Ammonia (enzymes)----> Organic compound Q + water +
Carbon...
(Solved)
The equation below represents a metabolic process that occurs in a certain organ in the m
mammalian body:-
Ammonia (enzymes)----> Organic compound Q + water +
Carbon (IV) oxide
a) Name the process represented in the equation.
b) Name the organ in which the process occurs.
c) Why is the process important to the mammal?
d) Identify the organic compound Q.
e) Explain the source of ammonia in the organ named in (b) above.
f) What happens to organic compound Q?
Date posted:
June 17, 2019
.
Answers (1)
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Distinguish between internal environment and external environment
(Solved)
Distinguish between internal environment and external environment
Date posted:
June 17, 2019
.
Answers (1)
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State two classes of phylum chordata where all members are poikilothermic .
(Solved)
State two classes of phylum chordata where all members are poikilothermic .
Date posted:
June 17, 2019
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Answers (1)
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What is poikilotherm?
(Solved)
What is poikilotherm?
Date posted:
June 17, 2019
.
Answers (1)
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The diagram below shows simplified structures of kidneys from two different animals.
(a) Suggest possible habitat in which animal N is found.
(b) Give two reasons for...
(Solved)
The diagram below shows simplified structures of kidneys from two different animals.
(a) Suggest possible habitat in which animal N is found.
(b) Give two reasons for your answer in (a) above.
Date posted:
June 17, 2019
.
Answers (1)
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Explain the effects of the following on the quantity and composition of urine
(a) Drinking large amount of clean water
(b) Drinking very salty soup
(c) Removal of...
(Solved)
Explain the effects of the following on the quantity and composition of urine
(a) Drinking large amount of clean water
(b) Drinking very salty soup
(c) Removal of pancreas
Date posted:
June 17, 2019
.
Answers (1)