1[2 marks]
The scientific name of the domestic dog is Canis familiaris. The scientific name of the wolf is Canis lupus. (a) What does the first word in both names tell you? (1) (b) Name the group in the Linnaean system that comes just above genus. (1)
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- (a) they are in the same genus (1)
- (b) family (1)
2[2 marks]
Carl Woese developed the three-domain system of classification. (a) Name the three domains. (1) (b) Give one development in biology that led scientists to propose new models of classification. (1)
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- (a) archaea, bacteria and eukaryota, all three needed (1)
- (b) any one from: improvements in microscopes gave evidence of internal structures / understanding of biochemical processes progressed / evidence from chemical analysis (1)
3[2 marks]
An evolutionary tree shows that species P and species Q split from a common ancestor 10 million years ago. Species R split from the line leading to P and Q 40 million years ago. Which species is more closely related to P: Q or R? Explain your answer.
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- Q (1)
- P and Q share a more recent common ancestor / split more recently (10 million years ago rather than 40 million years ago) (1)