The practice increases chance of homozygosity of recessive / undesirable / lethal genes; leading to expression of such
phenotypes in the offspring. This may lead to poor adaptation and survival of the offsprings;
sharon kalunda answered the question on May 29, 2019 at 08:31
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A certain organ K was surgically removed from a rat. It was later found that there was a drastic increase in glucose level in the
blood....
(Solved)
A certain organ K was surgically removed from a rat. It was later found that there was a drastic increase in glucose level in the
blood. When substance Q was injected into the animal the glucose in the blood went back to normal. Identify
i) Organ K
ii) Substance Q.
Date posted:
May 29, 2019
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Answers (1)
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Explain the biological disadvantage of growing some aesthetic plants in the living rooms.
(Solved)
Explain the biological disadvantage of growing some aesthetic plants in the living rooms.
Date posted:
May 29, 2019
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Answers (1)
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In a family with four children three were found to have normal skin pigmentation while one was an albino. Using letter A to represent gene...
(Solved)
In a family with four children three were found to have normal skin pigmentation while one was an albino. Using letter A to represent gene for normal skin pigmentation and a to represent the gene for albinism.
(a) What are the possible genotypes of the parents?
(b) Work out the genotypic ratio of their children.
(c) Apart from albinism, name two disorders that are genetically inherited in human beings.
Date posted:
May 29, 2019
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Answers (1)
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A student collected a bone from the school garden. The bone was measuring 45 cm. He drew the bone in his book and his diagram...
(Solved)
A student collected a bone from the school garden. The bone was measuring 45 cm. He drew the bone in his book and his diagram was 9 cm long.Calculate the magnification of his drawing.
Date posted:
May 29, 2019
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Answers (1)
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In an ecological study a grass hopper population and that of crows was estimated in a certain grass land area over a period of
one year....
(Solved)
In an ecological study a grass hopper population and that of crows was estimated in a certain grass land area over a period of
one year. The results are as shown in the table below.
a) i) What is the relationship between the rainfall and grasshoppers population?
ii) Account for the relationship stated in a (i) above
b) Explain the relationship between the grasshopper and the crows population.
c) If the data was used in the construction of pyramid of numbers, what would be the trophic level of:
i) Grasshopper
ii) Crows
iii) The grass in the study area
d) If the area studied was on a square kilometer, state
i) One method that could have been used to estimate the grasshopper population.
ii) One method that could have been used to estimate the crows population.
e) Suggest what would happen if a predator for grasshoppers entered the study area.
Date posted:
May 29, 2019
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Answers (1)
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The diagram below represents a set-up to investigate a certain physiological process.
After some time the level of sugar solution was observed to have risen.
a) What...
(Solved)
The diagram below represents a set-up to investigate a certain physiological process.
After some time the level of sugar solution was observed to have risen.
a) What physiological process was being investigated.
b) Account for the rise in the level of sugar solution.
c) Suggest the result that would be observed if the experiment was repeated using a piece of boiled potato.
Date posted:
May 29, 2019
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Answers (1)
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The diagram below represents a gill of a bony fish . Study it and answer the questions that follow.
Give the function of each of the...
(Solved)
The diagram below represents a gill of a bony fish . Study it and answer the questions that follow.
Give the function of each of the lablled parts A, B and C
Date posted:
May 29, 2019
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Answers (1)
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a)Construct a dichotomous key to key out the following organisms using the following steps
Step 1: Body covering
Step 2: Animal with 3pairs of walking limbs or...
(Solved)
a)Construct a dichotomous key to key out the following organisms using the following steps
Step 1: Body covering
Step 2: Animal with 3pairs of walking limbs or more
Step 3: Animals with four pairs of legs
Step 4 : Number of walking limbs per segment.
b) With reasons state the class to which the organisms belong.
i) S. gregaria
ii) S. coleopata
Date posted:
May 28, 2019
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Answers (1)
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a)A student from Kegonga used a microscope with X40 objective lens and X5 eye piece lens which had 2mm radius and
counted 5 cells. Calculate the...
(Solved)
a)A student from Kegonga used a microscope with X40 objective lens and X5 eye piece lens which had 2mm radius and
counted 5 cells. Calculate the area of the field of view in micrometers.
b) What is the average size of the cell in micrometers?
Date posted:
May 28, 2019
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Answers (1)
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In an ecological study a certain insect population and that of predators was estimated in a certain grassland over a period of 1 year (one...
(Solved)
In an ecological study a certain insect population and that of predators was estimated in a certain grassland over a period of 1 year (one year).
(a) Using the information above plot on the same axis the graph of number of insects and number of predators against time in months.
(b) Suggest what happens to the insect’s population during dry months.
(c) Explain the relationship between the insect population and that of predators.
(d) Suggest what happens to the predator’s population during dry month.
(e) Name the trophic level occupied by:-
(i) Predator
(ii) Insects
(iii) Grass
(f) Name the method used to estimate population of:
(i) Predator
(ii) Insects
(iii) Grass
Date posted:
May 28, 2019
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Answers (1)
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In fruit flies (Drosophila melanongaster) inheritance of eye colour is sex linked. The gene for red eye is dominant.
Across was made between homozygous red eyed...
(Solved)
In fruit flies (Drosophila melanongaster) inheritance of eye colour is sex linked. The gene for red eye is dominant.
Across was made between homozygous red eyed female and white eyed male. Work out the phenotypic ratio of F1
generation. (Use R to represent gene for red eyes).
Date posted:
May 28, 2019
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Answers (1)
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Give a reason why it is difficult to calculate Respiratory Quotient (RQ) in plants.
(Solved)
Give a reason why it is difficult to calculate Respiratory Quotient (RQ) in plants.
Date posted:
May 28, 2019
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Answers (1)
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The following set up was used in an experiment
(a) State the function of the following in the set –up.
i). damp cotton wool
ii) Silica gel.
iii) Wax.
b)...
(Solved)
The following set up was used in an experiment
(a) State the function of the following in the set –up.
i). damp cotton wool
ii) Silica gel.
iii) Wax.
b) Deduce the condition that must be present in a termite habitat
Date posted:
May 28, 2019
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Answers (1)
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The graph below show the rate of an enzyme controlled reaction against temperature (OC)
Explain the shape of the curve:
(i) Between A and B
(ii) At...
(Solved)
The graph below show the rate of an enzyme controlled reaction against temperature (OC)
Explain the shape of the curve:
(i) Between A and B
(ii) At Point C
(iii) Between C and D
(iv) Other than temperature, state two factors that affect the above reaction
Date posted:
May 28, 2019
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Answers (1)
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A student in form 3 caught an organism which had the following characteristics.
(i) Body divided into two parts
(ii) Simple eyes
(iii) Eight legs
Classify the organism up...
(Solved)
A student in form 3 caught an organism which had the following characteristics.
(i) Body divided into two parts
(ii) Simple eyes
(iii) Eight legs
Classify the organism up to the class level
Date posted:
May 28, 2019
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Answers (1)
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Explain each of the following:
(a) A mature plant cell does not lose its shape even after losing water
(b) Xylem vessels do not collapse even when...
(Solved)
Explain each of the following:
(a) A mature plant cell does not lose its shape even after losing water
(b) Xylem vessels do not collapse even when they are not conducting water
Date posted:
May 28, 2019
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Answers (1)
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(i)Identify the mode of feeding of the animal whose dental formula is shown below
(ii) Give reasons for your answer in (i) above
(Solved)
(i)Identify the mode of feeding of the animal whose dental formula is shown below
(ii) Give reasons for your answer in (i) above
Date posted:
May 28, 2019
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Answers (1)
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The diagram below represents a cell as seen under an electron microscope.
a) Identify the parts labeled A and D.
b) State the function of the...
(Solved)
The diagram below represents a cell as seen under an electron microscope.
a) Identify the parts labeled A and D.
b) State the function of the structures found on the part labeled D.
Date posted:
May 28, 2019
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Answers (1)
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An experiment was carried out to investigate transpiration and absorption of water in sunflower plants in their natural environment with adequate supply of water. The...
(Solved)
An experiment was carried out to investigate transpiration and absorption of water in sunflower plants in their natural environment with adequate supply of water. The amount of water was determined in two hour intervals. The results are shown in the table below.
(a) Using the same axes, plot graphs to show transpiration and absorption of water in grammes against time of the day.
(b) At what time of the day was the amount of water the same for transpiration and absorption.
(c) Account for the shape of the graph of
(i) Transpiration
(ii) Absorption
(d) What would happen to transpiration and absorption of water if the experiment was continued till 0050 hours.
(e) Name two factors that may affect transpiration and absorption at any given time.
(f) Explain how the factors you named in (e) above affect transpiration.
Date posted:
May 28, 2019
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Answers (1)
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A portion of a nucleic acid is shown below;
a) Name the nucleic acid to which the portion belongs. Give a reason.
b) Write down the...
(Solved)
A portion of a nucleic acid is shown below;
a) Name the nucleic acid to which the portion belongs. Give a reason.
b) Write down the sequence of bases of a complimentary strand to the one above.
Date posted:
May 28, 2019
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Answers (1)