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Current continents existed as one large land mass/ Paingea/ Laureshia Guondaland. The present continent drifted leading to isolation of organisms. Organisms in each group adapted to different lines hence emergence of new species.
johnmulu answered the question on May 13, 2017 at 09:44
- What is meant by
(a) Organic evolution?
(b) Continental drift? (Solved)
What is meant by
(a) Organic evolution?
(b) Continental drift?
Date posted: May 13, 2017. Answers (1)
- Give reason why each of the following is important in the study of evolution:
(a) Fossils records.
(b) Comparative anatomy. (Solved)
Give reason why each of the following is important in the study of evolution:
(a) Fossils records.
(b) Comparative anatomy.
Date posted: May 13, 2017. Answers (1)
- State two advantages of natural selection to organisms. (Solved)
State two advantages of natural selection to organisms.
Date posted: May 13, 2017. Answers (1)
- State three pieces of evidence that support theory of evolution(Solved)
State three pieces of evidence that support theory of evolution
Date posted: May 13, 2017. Answers (1)
- Give a reason why it is only mutation in genes of gametes that can influence evolution.(Solved)
Give a reason why it is only mutation in genes of gametes that can influence evolution.
Date posted: May 13, 2017. Answers (1)
- State two advantages of hybrid vigour. (Solved)
State two advantages of hybrid vigour.
Date posted: May 13, 2017. Answers (1)
- (a) What is meant by the term genetics
(b) State two examples of discontinuous variation. (Solved)
(a) What is meant by the term genetics
(b) State two examples of discontinuous variation.
Date posted: May 13, 2017. Answers (1)
- State three structural differences between DNA and RNA. (Solved)
State three structural differences between DNA and RNA.
Date posted: May 13, 2017. Answers (1)
- Differentiate between phenotype and genotype as used in genetics (Solved)
Differentiate between phenotype and genotype as used in genetics
Date posted: May 13, 2017. Answers (1)
- (a) What is meant by the term sex linked genes?
(b) Name two sex linked traits in human beings. (Solved)
(a) What is meant by the term sex linked genes?
(b) Name two sex linked traits in human beings.
Date posted: May 13, 2017. Answers (1)
- (a) Differentiate between the following terms: (i) Dominant gene and recessive gene;
(ii) continuous variation and discontinuous variation.
(b) What would be the expected results from a test cross? (Solved)
(a) Differentiate between the following terms: (i) Dominant gene and recessive gene;
(ii) continuous variation and discontinuous variation.
(b) What would be the expected results from a test cross?
Date posted: May 13, 2017. Answers (1)
- (a) What is meant by the term non-disjunction?
(b) Give an example of genetic disorder caused by: (i) Non-disjunction; (ii) Gene mutation. (Solved)
(a) What is meant by the term non-disjunction?
(b) Give an example of genetic disorder caused by: (i) Non-disjunction; (ii) Gene mutation.
Date posted: May 13, 2017. Answers (1)
- State two advantages of hybrid vigour (Solved)
State two advantages of hybrid vigour
Date posted: May 13, 2017. Answers (1)
- (a) What is meant by the following terms (i) hybrid vigour (ii) Polyploidy?
(b) State two causes of chromosomal mutations. (Solved)
(a) What is meant by the following terms (i) hybrid vigour (ii) Polyploidy?
(b) State two causes of chromosomal mutations.
Date posted: May 13, 2017. Answers (1)
- (a) What is meant by non-disjunction?
(b) Give two examples of continuous variation in humans(Solved)
(a) What is meant by non-disjunction?
(b) Give two examples of continuous variation in humans
Date posted: May 13, 2017. Answers (1)
- (a) What is meant by the term allele?
(b) What is a test-cross? (Solved)
(a) What is meant by the term allele?
(b) What is a test-cross?
Date posted: May 13, 2017. Answers (1)
- (a) Name two disorders in human caused by gene mutation.
(b) Describe the following chromosomal mutations. (i) Inversion (ii) Translocation(Solved)
(a) Name two disorders in human caused by gene mutation.
(b) Describe the following chromosomal mutations. (i) Inversion (ii) Translocation
Date posted: May 13, 2017. Answers (1)
- (a) What is meant by the term sex-linkage?
(b) Name two sex-linked traits in humans. (Solved)
(a) What is meant by the term sex-linkage?
(b) Name two sex-linked traits in humans.
Date posted: May 13, 2017. Answers (1)
- Give an example of a sex-linked trait in humans on:
Y - CHROMOSOME.
X - CHROMOSOME. (Solved)
Give an example of a sex-linked trait in humans on:
Y - CHROMOSOME.
X - CHROMOSOME.
Date posted: May 13, 2017. Answers (1)
- State two characteristics that researchers select in breeding programme. (Solved)
State two characteristics that researchers select in breeding programme.
Date posted: May 13, 2017. Answers (1)