Module 4 - Species and taxonomy

Question 1

2 marks

During courtship males of a bird species vibrate their wings which produces a sound.
Explain how this sound helps to ensure that the female mates only with a male of the same species.

Answer 1

• Female recognises own species sound
• Respond to that soundy only
• Courtship sequence continues

Question 2

1 mark

Define phylogenetic classification

Answer 2

Grouped according on evolutionary orgins.

Question 3

1 mark

Define heirachy

Answer 3

Smaller groups within larger groups with no overlap

Question 4

2 marks

Explain why biologists use protein structure to investigate the realtionship between different species of cranes.

Answer 4

1. More closely related species have more similarities in amino acid sequence
2. In same protein
3. Amino acid sequence is related to DNA base/triplet sequence;

Question 5

2 marks

Explain why temperatures could be used to fine the % of DNA hybridisation

Answer 5

Higher temperature= more energy required= the higher the percentage DNA hybridisation = more bases are similar
Correct reference to breaking hydrogen bonds / more/less hydrogen bonds being present;

Question 6

2 marks

Describe how organisms are grouped in a phylogenetic classification system.

Answer 6

1. Heirachy (smaller groups within larger groups) with no overlap
2. Grouped according to evolutionary origins