According to natural classification, organisms in the same group had what fy1rmazg6s 6 njcc8k*6jk sa9:-2 o scin com91oa 2ja-8f:6cysk 6*nsc ks6r mgjczmon?

  The diagram below re/v a s)p1n ul 2l9o;2wjf8ryyppresents the three domains of life.

  The organisms in theoeyk/u i;k-n: table below all share a common ancestor.


1.1.Use the data in the table to draw a cladogram.

1.2.State the source of variation which allowed organisms in the cladogram to diverge into different species.
the name is   .
2.In cladistics, state the name used to describe a group of organisms which have all evolved from a common ancestor. the name is   .

  Which of the following statements is t3fter )y u; xa0ltgh,8he correct definition of evolution?

  Which of the following represents the correct order for taxonomic level96gsx:2sx)os, jdbi 8lwl d2m3ljkf; s used in j:)sdlwkmb 9d j36sil xlsf g ;2x,o28biological classification?

  What evidence can be, and has been 53al5px ykcy; q8y+kvau f-ww5b+ d uj/:q h,mused, to determine the members of the same cla;bkx5ypw5m3daah:5c k +fuvu-8 q jywy/ql,+de?
I. Base sequence of genes
II. Amino acid sequence of proteins
III. Physical appearance of organisms

  In cladistics, which is the correct definition of a cl67gcc3 cef ro3ade?

  To which domain do organisms with membrane-enclosed organelles wvs9y3i*utf3p7 elq4hhv8 r: belong to?

  Which arrow correctly identifies a node in the cllka*8g 7n6 -fln7diuk adogram?

  According to the cladogram, which two primag5.;hz frtb3ftes are the most closely related?

  Early cladograms were constructed by comparing s pwi vnh 7mc8yl-)/xn,r;glp4tructures of organisms. The cladogram on the left is based on structure and the cladogram on the right is based on comparing the DNlvncr/);np w 84lxm ,ph7iy- gA sequence of a particular gene.


What is the reason that the cladogram based on the DNA sequences is a more reliable representation of the sequence of divergence among clades than the cladogram based on structures?

  What information can be zrj6wzw21r(9rn w.b ydeduced from the cladogram?

  The cladogram below shows three possible evolutionary o). zr ukxuau76rigins of the platypus (Platykur7u )x.azu6pus X, Y, and Z), an egg-laying mammal with webbed feet. The italicised taxa are extinct.


1.1.State the taxa most closely related to marsupials.
   are most closely related to marsupials. They are both members of Theria.

1.2.Based on the taxa shown in the cladogram, deduce one reason for the difficulty in identifying the true divergence of the platypus.

2.1.The cladogram shown is based on morphological traits. Describe one other type of evidence that can be used to deduce evolutionary relationships.

2.2.Suggest one type of morphological evidence that could be used to provide support for Platypus Z over Platypus X as the origin of the platypus.

3.Taxonomists classify organisms according to their evolutionary origins using a hierarchical classification system.

Outline the principal taxonomic ranks in the modern classification system.

  Which of the following would not be a reason for reclassificatiyop yb0z gj-) e- .p8,.tksmea85wnogon?

  Which of the following is not evidence fe7..o0.;qvpwaw g 82;vom ;yctcmpxz 1mbe9hor organisms being in the same clade?

  What is the relationship between the number otj4tw h mv.ke6md38.sf differences in DNA base sequences and time since divergence from a common ancest..4jse 8 dvtwmh6mt k3or?

  The table shows the number of diffx-op*h d hwk:e:pqzn.d8 le9, erences in amino acid sequences for the Insulin-A protein, between 9 e.w:-kphdn,:zohx* pe l8dq pigs and other organisms.

Which organism would be furthest from pigs in a cladogram?

  A study was completed .epgci (i0g v)9v-ocwon the Cistus sp. of the Mediterranean to look at the relationship between the different white-flowered species. Cistus is a genus of plants that ar-vi)cpigv. oe 9g(0c we shrubs and are commonly known as rockroses.

The cladogram below shows the relationship between species of the Cistus genus and also includes the genera Fumana, Helianthemum, Tuberia and Halimium.


1.1.Determine the number of nodes between the common ancestor indicated by ‘A’ in the diagram and the clade of Cistus with purple flowers.There are    nodes

1.2.Identify the genus containing the highest number of species in this cladogram.The genus with the most species is   .

1.3.Calculate the percentage of species that belong to the genus that you have named in (ii).it=  %.

1.4.Based on this cladogram outline the relationship between Cistus and Halimium species.


2.1.Identify two species that are the only white-flowered Cistus species in their ecosystem type.

2.2.Deduce, with a reason, the ecosystem with the greatest variety of Cistus species.

2.3.Discuss the evidence from the cladogram that ecosystem type is a factor that contributes to evolution.

Log-Bayes factor is a statistical tool. It was used to evaluate the influence of the environment and insolation on three characteristics of Cistus species.

·Environment is the type of ecosystem
·Insolation is the solar energy that reaches a surface

The three factors studied were leaf shape, labdanum secretion and leaf pubescence.

·The leaf shape of Cistus species is linear or ovate
·Labdanum secretion is the resin or gum that is secreted by Cistus species during hot weather
·Leaf pubescence is the fine hair on leaves and stems that helps to keep leaves cool

The table below gives the log-Bayes factor for the relationships between: (i) leaf shape and environment, (ii) leaf shape and insolation, (iii) labdanum secretion and environment, (iv) labdanum secretion and insolation, (v) leaf pubescence and environment, and (vi) leaf pubescence and insolation.
Log-Bayes factor between -0.1 and 1 indicates ‘barely correlated’ between the factors. Log-Bayes factor less than -0.1 indicates ‘evidence against correlation’. The greater the positive log-Bayes factor, the greater the evidence for correlation



3.1.Deduce, based on the log-Bayes values, which factor, environment or insolation, has the strongest correlation with the three characteristics.
3.2.Using all of the data, evaluate the evidence that the environment has been a significant factor in the evolution of the Cistus species.

1.Outline how mitochondrial 0yjdn1g- 4 oi ypa*n/pDNA can be used to construct a cladogram.

2.Explain why organisms classified in the past may be reclassified.

3.Compare and contrast cladograms made using molecular evidence and structural evidence.

  The DNA sequence from the same section of DNA but 9 . wh a)v42*pcnja,xp3we2uf4ilkc 3dn0i kufrom two different organisms is shown in the table below0c 3l29i)jnkk afx*nieup34 uh c42pwdv ,.wa.

Which organisms are most likely to have diverged from each other most recently?

The diagrams below show two cladograms for primates. One cladogram waslgbkyz 84b qk 7wgji4 9 g-tftx8z5.m) made using data from DNA sequences and the other using amino acid sequences. fzk)g i4w7ytgl5g-z.9jbbqk 88 4m xt


1.Identify the organism(s) most closely related to humans in the cladogram based on…

1.1.DNA sequences

1.2.amino acid sequences

2.Describe the advantage of using DNA sequences to construct cladograms compared to amino acid sequences.

2.Suggest why cladograms made using physical features are not reliable predictors of phylogenetic relationships.

  Organisms may be reclassified using evidence fr cg umh1 *tw)9ox:yd.bom cladistics. Cladogram 1, based on DNA comparisons of several species, represents the historical view of relationships among arachnids. Clcg t9h1)yow: .db *umxadogram 2, based on DNA comparisons of many more species than Cladogram 1, challenges the historical view.


What is suggested by Cladogram 2 that is not suggested by Cladogram 1?

1.Natural classification is used to group organisms wit n5ix((lqtch kaz *)7- df-b9et qky3sh common ancestry together, b h9za57y(x 3blin-c*( ) tkt-ekqsqfdased on similarities and shared characteristics. All organisms can be classified into one of the three domains.


1.List three characteristics of Eubacteria.
2.Distinguish between archaeans and eukaryotes.

2.The plant kingdom is part of the Eukaryota domain. The plant kingdom is further divided into phyla.


2.1.For the plant pictured above, deduce the phylum to which it belongs. Give a reason for your answer.
2.2Distinguish between the phylum you named in (i) and one other named plant phylum with which you are familiar.

3.Individual species can be grouped into families, based on a shared common attribute. Identify two changes that can result from reclassification of a family.