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-Comparative anatomy;members of a phykum/group show similarities;organisms have similar structures performing the same function for example digestive system, urinary system.
-The pentadactyl limb.
-Analogous structures/different structures performing the same function.for example ,wings of insects.
-Fossil records/palaeontology;these are remains of organisms preserved in naturally occurring materials for many years;They show morphological changes of organisms over a long period of time for example skull of a man.
-Comparative anatomy;Vertebrate embryos are morphologically similar; suggesting that the organisms have a common origin.
-Geographical distribution; present continents are thought to have been a large land mass joined together; As a result of continental drift;isolation occurred bringing about different patterns of evolution.
-Comparative serology/comparative physiology; blood groups/rhesus factor.Antigen antibody reactions;reveal same relationship among common ancestry.
Belan answered the question on February 15, 2019 at 12:06
- Outline FOUR main stages of DNA replication.(Solved)
Outline FOUR main stages of DNA replication.
Date posted: February 15, 2019. Answers (1)
- How are the following structures of a leaf adapted to their function?
(a)Petiole.
(b)Veins.
(c)Palisade mesophyl.
(d)Guard cells.(Solved)
How are the following structures of a leaf adapted to their function?
(a)Petiole.
(b)Veins.
(c)Palisade Mesophyl.
(d)Guard cells.
Date posted: February 15, 2019. Answers (1)
- Two pieces of raw potato chips A and B were placed in two different solutions in petridishes and left to stand for thirty minutes. At...(Solved)
Two pieces of raw potato chips A and B were placed in two different solutions in petridishes and left to stand for thirty minutes. At the end of the experiment, A was soft and a bit shrivelled, B was turgid and had increased in size.
(a)State the process that was being investigated.
(b)Account for the observations made in each case.
Date posted: February 15, 2019. Answers (1)
- In an experiment, a piece of brain was removed from a rat.It was later found that the rat had large fluctuation of body temperature. Suggest...(Solved)
In an experiment, a piece of brain was removed from a rat. It was later found that the rat had large fluctuation of body temperature. Suggest the part of brain which had been removed.
Date posted: February 15, 2019. Answers (1)
- Distinguish between:
(a)Genotype and phenotype.
(b)Haploidy and diploidy.(Solved)
Distinguish between:
(a)Genotype and phenotype.
(b)Haploidy and Diploidy.
Date posted: February 15, 2019. Answers (1)
- Briefly explain the meaning of apical dominance.(Solved)
Briefly explain the meaning of the term apical dominance.
Date posted: February 15, 2019. Answers (1)
- (a)Explain the meaning of the term test cross.
(b)Name the chromosomes which determine sex in humans.(Solved)
(a)Explain the meaning of the term test cross.
(b)Name the chromosomes which determine sex in humans.
Date posted: February 15, 2019. Answers (1)
- Explain why Lamarck's theory of inheritance was discarded(Solved)
Explain why Lamarck's theory of inheritance was discarded.
Date posted: February 15, 2019. Answers (1)
- (a)Define respiration.
(b)Give two differences between aerobic and anaerobic respiration.(Solved)
(a)Define respiration.
(b)Give two differences between aerobic and anaerobic respiration.
Date posted: February 15, 2019. Answers (1)
- (a)Name the method that can be used to calculate the total number of fish in a pond.
(Solved)
(a)Name the method that can be used to calculate the total number of fish in a pond.
Date posted: February 15, 2019. Answers (1)
- An organism was found to have the following characteristics.
-Jointed appendages.
-Body covered with a hard exoskeleton made of chitin.
-Lay eggs which later hatch into young...(Solved)
An organism was found to have the following characteristics.
-Jointed appendages.
-Body covered with a hard exoskeleton made of chitin.
-Lay eggs which later hatch into young ones.
-Has compound eyes.
-Body is segmented.
(a)Name the phylum to which the organism belongs.
(b)To which class does the organism belong?
(c)Give an example of an organism that belongs to this class.
Date posted: February 15, 2019. Answers (1)
- State the function of the deoxyribonuclei acid(DNA)molecule.(Solved)
State the function of the deoxyribonuclei acid (DNA)molecule.
Date posted: February 14, 2019. Answers (1)
- State two roles of hydrochloric acid in the stomach.(Solved)
State two roles of hydrochloric acid in the stomach.
Date posted: February 14, 2019. Answers (1)
- Differentiate between mechanical digestion and chemical digestion.(Solved)
Differentiate between mechanical digestion and chemical digestion.
Date posted: February 14, 2019. Answers (1)
- State the function of each of the following:
(i)Centriole
(ii)Plasmodesmata(Solved)
State the function of each of the following:
(i)Centriole
(ii)Plasmodesmata
Date posted: February 14, 2019. Answers (1)
- List the main steps involved in nitrogen cycling in the order they occur naturally(Solved)
List the main steps involved in nitrogen cycling in the order they occur naturally.
Date posted: February 13, 2019. Answers (1)
- What is the role of variation in evolution?(Solved)
What is the role of variation in evolution?
Date posted: February 8, 2019. Answers (1)
- Why is mitochondria called power house of the cell?(Solved)
Why is mitochondria called power house of the cell?
Date posted: February 8, 2019. Answers (1)
- Where do thermoreceptors for internal body temperature occur?(Solved)
Where do thermoreceptors for internal body temperature occur?
Date posted: February 6, 2019. Answers (1)
- Discuss the main types of reproduction in Protists.(Solved)
Discuss the main types of reproduction in Protists.
Date posted: January 30, 2019. Answers (1)