Chemical ionizing radiations, Uv light, extreme temperature or some virus
Kavungya answered the question on June 17, 2019 at 07:50
- Name a genetic disorder due to gene mutation that affects the malpighian layer of the
skin in man.(Solved)
Name a genetic disorder due to gene mutation that affects the malpighian layer of the
skin in man.
Date posted: June 17, 2019. Answers (1)
- Explain why prophase 1 of meiosis contributes towards genetic variation in living
organisms.(Solved)
Explain why prophase 1 of meiosis contributes towards genetic variation in living
organisms.
Date posted: June 17, 2019. Answers (1)
- Explain why growth of long hair on the pinnae of the ears in human occurs in males only(Solved)
Explain why growth of long hair on the pinnae of the ears in human occurs in males only
Date posted: June 17, 2019. Answers (1)
- In a certain breeding experiment, a plant species with red flowers was selfed. It produced 119
red flowered and 41 white flowered offsprings.
(a) Using letter R...(Solved)
In a certain breeding experiment, a plant species with red flowers was selfed. It produced 119
red flowered and 41 white flowered offsprings.
(a) Using letter R to represent allele for the red flowers, state the genotype of the red flowered
parent plant
(b) Determine the phenotypic ratio of red and white flowered plants. Show your working
Date posted: June 17, 2019. Answers (1)
- State the meaning of the following terms giving an example in each case:
(a) Sex-linked genes
(b) Multiple alleles(Solved)
State the meaning of the following terms giving an example in each case:
(a) Sex-linked genes
(b) Multiple alleles
Date posted: June 17, 2019. Answers (1)
- Explain; i) Why women should drink extra milk during pregnancyii) A pregnant women might want to urinate more often in late pregnancy(Solved)
Explain; i) Why women should drink extra milk during pregnancy
ii) A pregnant women might want to urinate more often in late pregnancy
Date posted: June 17, 2019. Answers (1)
- In an experiment, plants with red flowers was crossed with plants with white flowers.
All the plants in the F1 generation had pink flowers.
a) Give a...(Solved)
In an experiment, plants with red flowers was crossed with plants with white flowers.
All the plants in the F1 generation had pink flowers.
a) Give a reason for the appearance of pink flowers in the F1 generation
b) If plants in F1 were selfed, state the phenotypic ratio of the F2 generation
Date posted: June 17, 2019. Answers (1)
- Name one mutagenic agent(Solved)
Name one mutagenic agent
Date posted: June 17, 2019. Answers (1)
- There are at least 205 known sex – linked recessive disorder
a) Name any two of them.
b) State a reason why sex – linked recessive why...(Solved)
There are at least 205 known sex – linked recessive disorder
a) Name any two of them.
b) State a reason why sex – linked recessive why traits tend to effect the male child.
c) State why if a mother has the trait all her sons will have it
Date posted: June 17, 2019. Answers (1)
- 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)
- 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)
- 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)
- 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)
- 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. Answers (1)
- 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)
- 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)
- 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)
- 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)
- 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)
- 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)