classification

Question 1

hierarchy is

Answer 1

(It shows) smaller groups within larger groups / larger groups containing smaller groups;

Accept groups within groups

2. With no overlap (between groups);

Question 2

The scientists repeated their experiments, using female fruit flies as the visual stimulus. When a male and female D. willistoni were together, their songs led to mating.

When two female D. willistoni were together, their songs did not lead to any attempt to mate.

Use information from Figure 2 to suggest why the two females did not attempt to mat

Answer 2

(Three) peaks (in pulse song) occur at the same time (since both female) / songs identical / male peaks are different;

Accept suitable differences in male peaks eg number / length / amplitude / interval

2. (Therefore) no male (song) to stimulate / cause mating;

OR

Nothing to stimulate / cause mating;

Question 3

The diagram shows two different ways of classifying the same three species of snake.

*   Classification X is based on the frequency of observable characteristics

*   Classification Y is based on other comparisons of genetic characteristics.

All three species of snake belong to the Python family.

(a) What do these classifications suggest about the evolutionary relationships between these species of snake?

Classification X ______________________________________________________

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___________________________________________________________________

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Classification Y _

Answer 3

(Without genetic analysis / X) mackloti and olivaceus have a more recent common ancestor with each other (than with papuana);

2. (Genetic analysis indicates / Y) papuana and mackloti have a more recent common ancestor with one another (than with olivaceus

Question 4

State three comparisons of genetic diversity that the scientists used in order to generate Classification Y.

Answer 4

The (base) sequence of DNA;

Accept ‘DNA hybridisation’

2. The (base) sequence of mRNA;
3. The amino acid sequence (of proteins);