According to natural cloc9( j9lxa8n3riv ua9assification, organisms in the same group had what in commo9l 9vrc3 8j(oux an9ain?

  The diagram below represents the thre00lw 2p 5 zmldphef*e uapa75+e domains of life.

  The organisms in the table belowpym93jfo-n/ww. xxr* 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 the correct definition of evolutiqpdgz(k -f- t2on?

  Which of the following rep 5k) m25dww3i5n;4g .znmvdv 2pzb mhmresents the correct order for taxonomic levels used in biological classificatiomi wvhw 5.2zn g5kp d m2mm)v5zn4d;b3n?

  What evidence can be, and has been used, to determinio.,*q swgey5e the members of the same clade?og 5qiy, e*.sw
I. Base sequence of genes
II. Amino acid sequence of proteins
III. Physical appearance of organisms

  In cladistics, which is the correct definition ofw(4pq/gh/ ksa(v6r9 ferg40ci7cn ;u*zrg rz a clade?

  To which domain do organisms with membrane-enclosed organelles bel8x m1brmq;u y6ong to?

  Which arrow correctly identifies a n7qiasj5* h:fypr1 s9uode in the cladogram?

  According to the claplam+a. 9sm4,u)l mzsdogram, which two primates are the most closely related?

  Early cladograms were constructed by comparing sts6i16ep xaag*ructures of organisms. The cladogram on the left is based on structure and the cladogram on the right is based on comparing the DNA si6gx sap*1a e6equence 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 vz7iysrp*ztxd ( 4r)icran9p3y v -2 :be deduced from the cladogram?

  The cladogram below shows three possible evolutionar, twciv .:2bptjw8+wl y origins of the platypus (Plattc8:b+j, .wit lwvwp 2ypus 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 rea 1ph iolal8;r.son for reclassification?

  Which of the following is not evidenctgw,q /sn kn.x xj7,g;ps53zpe for organisms being in the same clade?

  What is the relationship between the num+q pr*7e96q*e7q 3anbo ;unk ax2ybtkber of differences in DNA base sequences and time since divergence frqon*enurk*;2+x7p3qa9 y6 qakb7bet om a common ancestor?

  The table shows the number of differences in amino acid sequsmmq4;;;kysm 5p1s zs ences for the Insulin-A protein, between pigs and other orga; zs4 ymsp;s sq1;mk5mnisms.

Which organism would be furthest from pigs in a cladogram?

  A study was completed on the Cistus sp. of the Mediterranean to look at the re s;6;; bj0ryv((jgjq ytjzq.rlationship between the different whi qg;yqtyj.0jz; rr( 6j;v(sjbte-flowered species. Cistus is a genus of plants that are 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 DNA can be use.g +;o qpj4 a7gslxjo/d 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 secal* xn890iu)k -4csog9 vwzzu u(6m iotion of DNA but from two different organisms is shown iuw9 i moz)*l0 sxi-akognu6zu89c v(4n the table below.

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

The diagrams below show two 5d-t4 2zz d-lkc ky-bbf 6q)oycladograms for primates. One cladogram was made using data from DNA sequences and the oth-bk4c2o-z)5yztk-b6 l yd qfd er using amino acid sequences.


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 from cladistics. Cladog(gxa qs/axq3 42z d7 7q l-ugyi8vmj3hram 1, based on DNA comparisons of several species, represents the historical view of relationships among arachnids. Cladogram 2, based on DNA commvq q73x2hgj7s 4i x/y(8gz aqau3-l dparisons 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 with common ancest7l v/xnhgq6v)fgj32j9 dtcx- ry together, based on similarities and shared characteristics. All organisms can be6-7v3/cgdg )jh flvq jt2n xx9 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.