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Starter 1. Give three main causes of variation within a population 2. Define the term ‘mutation’ 3. Can ‘skin cancer’ be inherited? Explain your answer. 4. Give one advantage of mutation

Starter Give three main causes of variation within a population Define the term ‘mutation’

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Starter Give three main causes of variation within a population Define the term ‘mutation’ Can ‘skin cancer’ be inherited? Explain your answer. Give one advantage of mutation (hint: read the pages 30 & 31). Sex chromosomes X = Female Chromosome Y = Male Chromosome - PowerPoint PPT Presentation

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Page 1: Starter Give three main causes of variation within a population Define the term ‘mutation’

Starter1. Give three main causes of

variation within a population2. Define the term ‘mutation’3. Can ‘skin cancer’ be inherited?

Explain your answer.4. Give one advantage of mutation

(hint: read the pages 30 & 31)

Page 2: Starter Give three main causes of variation within a population Define the term ‘mutation’
Page 3: Starter Give three main causes of variation within a population Define the term ‘mutation’
Page 4: Starter Give three main causes of variation within a population Define the term ‘mutation’
Page 5: Starter Give three main causes of variation within a population Define the term ‘mutation’
Page 6: Starter Give three main causes of variation within a population Define the term ‘mutation’

Sex chromosomes

X = Female ChromosomeY = Male Chromosome

All female gametes (e.g. eggs) will contain an ‘X’ chromosome.Half of all male gametes (e.g. sperms) will contain an ‘X’ and half will contain a ‘Y’.

Page 7: Starter Give three main causes of variation within a population Define the term ‘mutation’

Sex Determination

X = Female ChromosomeY = Male Chromosome

EGG SPERM ZYGOTE

X X XX = Girl

X Y XY = Boy

Page 8: Starter Give three main causes of variation within a population Define the term ‘mutation’

However, occasionally sperms carrying BOTH the ‘X’ and the ‘Y’ chromosomes are produced.

X + XY = XXYXXY is known as Klienfelter Syndrome

EGG SPERM ZYGOTE

X XY XXY

Page 9: Starter Give three main causes of variation within a population Define the term ‘mutation’

Even sperms carrying no sex chromosome are produced

X + nothing = XJust having an ‘X’ chromosome is known as Turner Syndrome

EGG SPERM ZYGOTE

X none X

Page 10: Starter Give three main causes of variation within a population Define the term ‘mutation’

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