The result of profiling various DNA samples in a criminal investigation is shown bleow.

What conclusion about the crime could the DNA analyst draw?

The diagram below shows changes in cell mass and DNA mass during two cell cycles.

It can be concluded from the graph that during the cell cycle....

What causes the genetic disorder where some males have the sex chromosome XXY?

Which ONE of the following is an example of artificial selection?

Two parents both have blood group A. Their child has blood group O. What is the best explanation for this pattern of inheritance?

The chromosome complement of a human individual who inherits an X chromosome from the father is...

Studies have shown that the number of dark moths in a woodland area next to an industrial area is related to the air pollution levels in the atmosphere. When the levels of pollution increase, trees become black from the smoke. Moths are eaten by birds in this area.

Which ONE of the following best descirbes what would happen to the number of dark moths when the air pollution levels change.

The table below shows some genotypes and phenotypes associated with a form of anaemia.

A person who has partial sickle-cell anaemia and an unaffected person have a child together. What are the chances of the child having severe sickle-cell anaemia?

Which ONE of the following is the best definition of a species?

What percentage of adenine bases is present in a DNA molecule of 2000 bases  if 400 of the bases are cytosine?

The linking of the present-day distribution of organisms with the past movements of continental plates

An inherited disease in which blood fails to clot properly

The type of inheritance which has a range of intermediate phenotypes for a particular trait.

A point where the exchange of genetic material occurs during crossing-over

The stage in the process of the formation of a protein determined by the codons in the mRNA

The position of a gene in a chromosome

The elimination of a species from the Earth

A process which can detect mutant genes in an individual

Introduces variation within a species

The type of cell division that takes place in angiosperm plants

An advantage of polyploidy in agriculture

Influences the inheritance of blood groups

The breeding of organisms over many generations in order to achieve a desirable phenotype

Discovered the double helical structure of DNA

Bonds that hold amino acids together in a protein molecule

Use the letters G and g and write down the genotype of the following:

a) A

b) J

If fruit fly C was crossed with a male having vestigial wings, what would be the possible genotype(s) of the offspring?

State the dominant wing characteristic of the flies used in these crosses.

Explain why the diagram above represents replication and not transcription

Identify the parts labelled:

a) 3

b) 4

Identify the nitrogenous bases labelled:

a) 1

b) 2

Give TWO reasons why this couple should undergo genetic counselling before having children.

What is the percentage chance that they will have a child is an unaffected male?

Explain why this disorder, although it is sex-linked, does NOT affect males only.

The genetic disorder is caused by a gene mutation in which the DNA triplet CAG is altered to TAG.

a) Name this type of mutation

b) Describe how the type of mutation mentioned above will affect the structure of the protein it codes for

Determine the possible genotypes and phenotypes of their offspring by representing a genetic cross.

What is the minimum number of DNA bases needed to code for amino acids of this enzyme?

The sequence of DNA bases coding for seven amino acids in the enzyme ribonuclease is:

GTT TAC TAC TCT TCT TCT TTA

The number of each type of amino acid coded for by this sequence of DNA bases is shown in the table below:

The first amino acid in this enzyme is Gly which is coded for by GTT in DNA. Use the DNA base sequence and the table above to work out the sequence of the remaining amino acids in this part of the enzyme.

How many chromosomes will each daughter cell have at the end of this cell division?

Give TWO reasons why this type of cell division is important

Which diagram (A, B or C) represents meiosis I?

Suggest why the chromosomes in diagram B will be genetically different from that of the parent cell at the beginning of meiosis.

Professor Berger called Australopithecus sebida a transitional fossil. Using the information in the list above, explain why he called A.sebida a species in transition.

Write down THREE characteristics from the list above that also apply to the Homo species

State TWO advantages of A.sebida being bipedal.

If a fossil of Australopithecus afarensis, dated 3.2 mya, is found in Asia, explain the implications for the "Our of Africa" hypothesis.

Explain why the information in the table supports the "Out of Africa" hypothesis.

Describe TWO genetic lines of evidence that support the "Out of Africa" hypothesis.

Identify TWO structures in the diagram that are

a) analogous

b) homologous

Describe how the homologous structures named in the previous question give evidence for evolution.

Describe how the different species on the four isalnds evolved over many generations from the original ancestor on the mainland

Explain your answer to the question above

Show the results for each trait above as bar graphs on the same system axes

Explain why age need NOT be controlled in this investigation

State ONE way in which the learners ensured reliable results

Will the learners accept or reject their hypothesis?

State any TWO planning steps that the learners had to consider before conducting the investigation

Which genotype appeared most frequently in the population in 1970?

State the genotype for resistance to DDT

Which genotype's chances of survival were reduced after the spraying of DDT was stopped in 1968?

How many alleles are involved in the trait for resistance in mosquitos?

Charles Darwin and Jean Baptiste de Lamarck had different ideas to explain evolution. Describe how each of them would have explained the evolution of the long necks of giraffes. Justify whose idea is more acceptable in the science community today.

NOTE:
NO marks will be awarded for answers in the form of flow charts or diagrams.