1. B1 Topic 1Classification, Variation and Inheritance
This topic looks at:: Classification, vertebrates and invertebrates, species, variation, reasons for variety, evolution, genes, explaining inheritance, genetic disorders.
List the 5 main groups of invertebrates.
Give the features of the five kingdoms of organisms.
Describe how you would tell the difference between a plant and a fungus.
Describe what we mean by variation in a species.
Give two problems with classifying a
group of organisms as a species.
Problem one...
Problem two...
List the seven classification groups of organisms in order, stating with the largest.
Viruses are not classified
in a kingdom. Explain why.
Keywords: variation, adaptation, Kingdom, characteristics, species, fertile, hybrid.
Match each word to its correct definition.
Definitions
Oviparous
Controlled body temperature
Viviparous
Lays eggs
Poikilotherm
Live births
homeotherm
Varying body temperature
Keywords: fertilisation, oxygen, reproduction, thermoregulation, absorption. Chordata,

2. l B1 Topic Classification, Variation and Inheritance
Give two extreme environmental conditions in deep-sea hydrothermal vents and
give an adaptation the Pompii worm has to live there. l
Describe how you would tell the difference between a protoctist and a prokaryote. .
Variation
When a characteristic only occurs in distinct forms,
it show continuous /discontinuous variation
Human blood group is an example of continuous/discontinuous variation.
Discontinuous variation is caused by genes only/by genes and the environment.
Give two problems with classifying a group of organisms as a species
Problem one
Problem two
How do scientists share new discoveries with other scientists?
Keywords: adapted, distribution curve, genetic variation. Environmental, variation.
Bats and birds are vertebrates with wings, but they are classified in different
vertebrate groups. Use these examples to help explain why it is sometimes difficult to classify vertebrates.
Describe the four ways that scientists sort vertebrates into main groups.
Keywords: eggs, temperature, live births, varying, backbones, gills, internal, lungs, internal, external, classified,

3. B1 Topic Classification, Variation and Inheritance
Artic foxes have thick fur and are white in winter. Explain how these characteristics are adaptations to the environment.
Explain what an identification key is used for
Construct a key to identify the following four animals:
elephant, dog, dolphin and human.
Darwin’s Theory
Give two sources of evolution by natural selection.
Keywords: overproduction, evolution, advantageous, survival, struggle, existence, DNA.
Define the terms
Natural selection
evolution
Name two extreme environmental conditions that occur near deep-sea hydrothermal vents. 1. 2.
Choose the correct words to make these sentences correct.
When a characteristics only occurs in distinct forms,
it shows continuous/discontinuous variation.
Human blood group is an example of continuous/discontinuous variation.
Discontinuous variation is caused by genes only/by genes and the environment.
Keywords: adapted, genes, extreme, polar, hydrothermal, high pressure, oxygen, acidic, pressure,

4. B1 Topic 1Classification, Variation and Inheritance
Explaining Inheritance.
Coat colour is inherited in rabbits by one gene. The dominant allele for this gene (B) gives a brown coat colour. The recessive allele (b) gives a black coat.
Write down the genotype and phenotype for a rabbit that is heterozygous for coat colour.
B) Complete the Punnett square to show the possible offspring form two heterozygous parents.
Write down the meaning of the following words...
Allele
Gene
Genotype for blue eyes is
Phenotype tells us ..
A pea plant has a recessive allele for white flower colour and a dominant allele for purple flower colour.
Identify if the plant is homozygous for heterozygous for flower colour and explain your answer.
Heterozygous or homozygous?
Reason why..
b) State whether the plant will have purple or white flowers.
Purple or white?
Reason why...
C) Write down the ratios of possible
genotypes and phenotypes of the offspring.
Genetic Disorders
Describe sickle cell disease
Family Pedigrees.
Explain what a pedigree diagram is, what it shows and how the are used .
Keywords: gene, homozygous, heterozygous monohybrid, inheritance, recessive, allele, evolution,
Cystic Fibrosis
Describe the symptoms of cystic fibrosis.
Keywords: genotype, phenotype, dominant, recessive, gene, chromosomes, nucleus, alternative, offspring, gametes.