Edexcel Unit B1 Topic 1 Classification, Variation and Inheritance

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1.1 Demonstrate an understanding of how biologists classify organisms according to
how closely they are related to one another including:
a Species ­ groups of organisms that have many features in common
b Genus ­ contains several species with similar characteristics
c Family ­ comprising of several genera
d Order ­ comprising of several families
e Class ­ comprising of several orders
f Phylum ­ comprising of several classes
g The Five Kingdoms ­ animalia, plantae, fungi, protoctista and prokaryotes
1.2 Describe the main characteristics of the five kingdoms including:
a Animalia ­ multicellular, do not have cell walls, do not have chlorophyll, feed
b Plantae ­ multicellular, have cell walls, have chlorophyll, feed autotrophically
c Fungi ­ multicellular, have cell walls, do not have chlorophyll, feed saprophytically
d Protoctista ­ unicellular, have a nucleus
e Prokaryotes ­ unicellular, have no nucleus
(REMEMBER ProtoCtista has a C so does nucleus)
1.3 Explain why scientists do not classify viruses in any of the five kingdoms and
regard them as non-living
1.4 Describe the main characteristics of the phylum Chordata as animals with a
supporting rod running the length of the body, an example of this being the backbone
in vertebrates
1.5 Explain how scientists place vertebrates into groups based on:
a Oxygen absorption methods ­ lungs, gills and skin
b Reproduction ­ internal or external fertilisation, oviparous or viviparous
c Thermoregulation ­ homeotherms and poikilotherms
1.6 Demonstrate an understanding of the problems associated with assigning
vertebrates to a specific group based on their anatomy and reproduction methods and
why many vertebrates are difficult to classify
Unit B1: Influences on life
1.7 Discuss why the definition of a species as organisms that produce fertile offspring
may have limitations: some organisms do not always reproduce sexually and some
hybrids are fertile
1.8 Explain why binomial classification is needed to identify, study and conserve species,
and can be used to target conservation efforts
1.9 Explain how accurate classification may be complicated by: a variation within a
b hybridisation in ducks
c ring species

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Construct and use keys to show how species can be identified
1.11 Explain how organisms are adapted to their environment and how some organisms
have characteristics that enable them to survive in extreme environments, including
deep-sea hydrothermal vents and Polar Regions
1.…read more

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Describe the structure of the nucleus of the cell as containing chromosomes, on
which genes are located
1.21 Demonstrate an understanding that genes exist in alternative forms called alleles
which give rise to differences in inherited characteristics
1.22 Recall the meaning of, and use appropriately, the terms: dominant, recessive,
homozygous, heterozygous, phenotype and genotype
1.23 Analyse and interpret patterns of monohybrid inheritance using a genetic
diagram, Punnett squares and family pedigrees
1.24 Calculate and analyse outcomes (using probabilities, ratios and
percentages) from monohybrid crosses
1.…read more


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