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– By keeping their mouth open/panting; to lose heat over surface area of the tongue by evaporation;
-Basking; to gain heat by conduction;
- Shivering; to generate heat through increased metabolism;
- Physical activity (e.g. running); to generate heat through metabolism;
- Hibernation; to increase metabolism;
- Putting on warm clothes when it is cold; to retain the heat energy;
- Reduction of physical activity; to reduce the metabolic rate;
- Migratory behaviour to cooler environment; to reduce the body temperature;
- Moving into water when it is hot; to cool the body;
- Staying around fire place; to gain heat by convection;
- Taking hot drinks; to warm the body;
Kavungya answered the question on June 17, 2019 at 08:04
- Study the genetic chart below showing the inheritance of the gene responsible for haemophilia
in a family.
a) Write the genotype of individuals A, B, F
b) A...(Solved)
Study the genetic chart below showing the inheritance of the gene responsible for haemophilia
in a family.
a) Write the genotype of individuals A, B, F
b) A member of this family labelled F marries a haemophiliac male. What will be the phenotypic
ratio of the offspring? Show your workings
c) Other than the condition stated above, state any other two common genetic disorders that
result from gene mutation.
Date posted: June 17, 2019. Answers (1)
- i)Identify the nucleic acid whose base sequence is shown below:
G-A-C-U-A-G-A-C-G
ii) Give a reason for your answer in c (i) above
iii) If the nucleic acid was...(Solved)
i)Identify the nucleic acid whose base sequence is shown below:
G-A-C-U-A-G-A-C-G
ii) Give a reason for your answer in c (i) above
iii) If the nucleic acid was involved in protein synthesis, how many amino acids would be
present in the protein synthesized? Give a reason
Date posted: June 17, 2019. Answers (1)
- In a certain bird species, red flight feathers is controlled by gene R while white flight feathers is
controlled by gene r. The heterozygous condition Rr...(Solved)
In a certain bird species, red flight feathers is controlled by gene R while white flight feathers is
controlled by gene r. The heterozygous condition Rr results into pink flight feathers. The two
genes are also sex linked and transmitted on x-chromosome.
a) By use of fusion lines, find the genotypes of across between a male with pink flight
feathers and a female with white flight feathers
b) Which type of dominance is illustrated here?
Date posted: June 17, 2019. Answers (1)
- A section of a DNA strand contains the following sequence CGGATAC
(a) Write the; (i) Complementary DNA strand
(ii) MRNA strand
(b) Name the site for protein synthesis...(Solved)
A section of a DNA strand contains the following sequence CGGATAC
(a) Write the; (i) Complementary DNA strand
(ii) MRNA strand
(b) Name the site for protein synthesis in a cell
Date posted: June 17, 2019. Answers (1)
- Name two mutagens(Solved)
Name two mutagens
Date posted: June 17, 2019. Answers (1)
- 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)