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AQA Biology Unit 2 Revision
Booklet
By Jack Richardson

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2.1- Living organisms vary, and this variation is influenced by genetic and
environmental factors
· Variation exists between members of a species (a group of organisms which can interbreed
and produce fertile offspring
· It is important to take a random sample (each individual is chosen entirely by chance, and…

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when needed for protein synthesis and cell division'
· Each nucleotide is held by a strong phosphodiester bond, as a result of a condensation
reaction
· On a particular strand of DNA, each gene has a fixed position (locus)
· The loci of genes that code for the same polypeptide…

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· A gene is a chemical code that contains the instructions for making a complete protein or
polypeptide/a section of DNA that contain coded information as a specific sequence of bases,
the code for polypeptides that determine the nature and development of organisms
· Different forms of genes are known…

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· Random fertilisation means any female gamete can

Page 9

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Page 10

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join with any male gamete
· Crossing over takes place during first prophase division-two of the chromatids on a
homologous pair of chromosomes can cross over the point at which they cross is known as the
chiasma
· When the chromosomes separate during anaphase, parts of the chromatids are swapped…

Comments

Hamza

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Brilliant, Thank you so much!! This is amazing 

tilda mascall

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Fantastic resorce, thanks :)

Miss Meera J

Report

Humza Productions!!!!

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Pages in this set

Page 1

Preview of page 1

Page 2

Preview of page 2
AQA Biology Unit 2 Revision
Booklet
By Jack Richardson

Page 3

Preview of page 3

Page 4

Preview of page 4
2.1- Living organisms vary, and this variation is influenced by genetic and
environmental factors
· Variation exists between members of a species (a group of organisms which can interbreed
and produce fertile offspring
· It is important to take a random sample (each individual is chosen entirely by chance, and…

Page 5

Preview of page 5
when needed for protein synthesis and cell division'
· Each nucleotide is held by a strong phosphodiester bond, as a result of a condensation
reaction
· On a particular strand of DNA, each gene has a fixed position (locus)
· The loci of genes that code for the same polypeptide…

Page 6

Preview of page 6

Page 7

Preview of page 7
· A gene is a chemical code that contains the instructions for making a complete protein or
polypeptide/a section of DNA that contain coded information as a specific sequence of bases,
the code for polypeptides that determine the nature and development of organisms
· Different forms of genes are known…

Page 8

Preview of page 8
· Random fertilisation means any female gamete can

Page 9

Preview of page 9

Page 10

Preview of page 10
join with any male gamete
· Crossing over takes place during first prophase division-two of the chromatids on a
homologous pair of chromosomes can cross over the point at which they cross is known as the
chiasma
· When the chromosomes separate during anaphase, parts of the chromatids are swapped…

Comments

Hamza

Report

Brilliant, Thank you so much!! This is amazing 

tilda mascall

Report

Fantastic resorce, thanks :)

Miss Meera J

Report

Humza Productions!!!!